|
Jeff Goldstein
Yes, we’ll post the meeting on FB. Also, Shawn will archive the meeting, too. Sorry, you can’t be there for the fun! Jeff G
From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of Roland Sent: Thursday, February 2, 2023 3:38 PM To: BackBayAstro@groups.io Subject: Re: [BackBayAstro] February BBAA Meeting this Thursday I’ve had something come up and will not be able to attend tonight, in person or on zoom. Are the meetings archived? If they are what is the link to access them? Roland Should I break out my sextant?
On Feb 1, 2023, at 4:04 PM, Jeff Goldstein <jeffgold1@...> wrote:
Dino, Sounds like a great story for those not on the groups.io. Please plan on attending tomorrows meeting in person! Jeff G When I was involved with my nautical living history group we did this demo using the noon sighting. One of our members had an insurance-worthy chronometer from the late 1800s that kept the most accurate time imaginable. At one event we pulled out an actual chart to plot the position - rather than just going through the explanation and showing those who stopped to view the demo how it was done, and what the end resulting Lat. and Long. position was by the numbers - and when we plotted this one we were way off the mark. Thought it was a fluke so we let everyone know that we were going to check the chronometer that evening and try it again the following day. Well, the chronometer was spot on with the Time Tick from Ft. Collins, CO, and when the owner of the chronometer tried it again using celestial plotting with Polaris (the star) his plot was still way off. The following day we scratched our heads over this. Then the noon sighting demo had us way off again. And then someone asked about that accursed Daylight Savings Time. (Face palm and heel-of-the-hand-to-the-forehead moment!) We were shooting the "noon" sighting at 1200 EDT, which was actually 1100 EST! Well, we tried it again at 1300 EDT (1200 EST) and this time the plot put is right on the money. When the sighting with Polaris was tried later that night - this time taking into account the fact that "local" time was an hour ahead of what it should be - the chronometer didn't fail us and using the proper time difference the night sighting put us right where we should be. So, from then on when we explained this sort of navigation during a demo we made sure to add in the effect that Daylight "Sucking" Time had on the noon and night (star) sighting, and how anyone in our modern age going for a sighting would have to do it at 1 PM rather than at 12 PM, and adjust the night sighting by an hour because of the local clocks being an hour ahead of "normal"; when you thought it was noon because "DST" said so, you were actually still an hour away from "normal" noon, and while Polaris at night might give you a correct Lat., you needed a correct local time to get a correct Long. calculation. Just imagine the carnage it would cause if you went back in time to a point before DST was made an annual fixture and set a fleet's ship's clocks ahead an hour. They'd be off by several hundred nautical miles (nm), since Long. is based on your Lat. which is taken and calculated from a noon sighting (provided you're not clouded over), or your angle of Polaris along with the time difference between "local" time and the chronometer's Greenwich Mean Time (GMT). If your Lat. is off, your Long. is going to be off by varying distances thanks to the Earth's roundness: 1 degree Lat. = 60 nm, constant because they're parallels; 1 degree Long. = 60 nm at the equator - and will decrease as you move towards the north or south poles, to the point where at the poles, your Long. is nothing more than "points" - and the Long. is also calculated by the difference between GMT and local time with that distance being different depending on your Lat. It's been over 12 years since I've done any of this (I'd still be doing it if my back hadn't put be out of action), and longer since doing it on my buoy tender (ca. 1983) so I'm rather rusty, and my living history navigation equipment with a detailed-yet-easy to understand explanation of the above is stashed away... somewhere. But I thought I'd mention that DST needs to be taken into account when using our local "star" for daytime celestial navigation to calculate Lat., or using Polaris for night celestial navigation... just in case my living history group wasn't the only ones that hadn't realized that. (So we can add Celestial Navigation to the list of reasons to do away with DST and leave our fracking clocks alone and on EST/CST/etc. from now on!) Keep looking through that sextant, "and keep looking up!" Dino.
-----Original Message-----
From: George Reynolds via groups.io <pathfinder027@...>
To: BBAA-Group <backbayastro@groups.io>
Sent: Tue, Jan 31, 2023 5:12 pm
Subject: [BackBayAstro] February BBAA Meeting this Thursday Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12. Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation. For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
Back Bay Amateur Astronomers (BBAA)
http://www.backbayastro.org
|
|
|
They are.
go down to the meeting minutes section and you'll find ,mp4 video files of the meeting.
I’ve had something come up and will not be able to attend tonight, in person or on zoom. Are the meetings archived? If they are what is the link to access them?
Roland Should I break out my sextant? On Feb 1, 2023, at 4:04 PM, Jeff Goldstein <jeffgold1@...> wrote:
Dino, Sounds like a great story for those not on the groups.io. Please plan on attending tomorrows meeting in person! Jeff G When I was involved with my nautical living history group we did this demo using the noon sighting. One of our members had an insurance-worthy chronometer from the late 1800s that kept the most accurate time imaginable. At one event we pulled out an actual chart to plot the position - rather than just going through the explanation and showing those who stopped to view the demo how it was done, and what the end resulting Lat. and Long. position was by the numbers - and when we plotted this one we were way off the mark. Thought it was a fluke so we let everyone know that we were going to check the chronometer that evening and try it again the following day. Well, the chronometer was spot on with the Time Tick from Ft. Collins, CO, and when the owner of the chronometer tried it again using celestial plotting with Polaris (the star) his plot was still way off. The following day we scratched our heads over this. Then the noon sighting demo had us way off again. And then someone asked about that accursed Daylight Savings Time. (Face palm and heel-of-the-hand-to-the-forehead moment!) We were shooting the "noon" sighting at 1200 EDT, which was actually 1100 EST! Well, we tried it again at 1300 EDT (1200 EST) and this time the plot put is right on the money. When the sighting with Polaris was tried later that night - this time taking into account the fact that "local" time was an hour ahead of what it should be - the chronometer didn't fail us and using the proper time difference the night sighting put us right where we should be. So, from then on when we explained this sort of navigation during a demo we made sure to add in the effect that Daylight "Sucking" Time had on the noon and night (star) sighting, and how anyone in our modern age going for a sighting would have to do it at 1 PM rather than at 12 PM, and adjust the night sighting by an hour because of the local clocks being an hour ahead of "normal"; when you thought it was noon because "DST" said so, you were actually still an hour away from "normal" noon, and while Polaris at night might give you a correct Lat., you needed a correct local time to get a correct Long. calculation. Just imagine the carnage it would cause if you went back in time to a point before DST was made an annual fixture and set a fleet's ship's clocks ahead an hour. They'd be off by several hundred nautical miles (nm), since Long. is based on your Lat. which is taken and calculated from a noon sighting (provided you're not clouded over), or your angle of Polaris along with the time difference between "local" time and the chronometer's Greenwich Mean Time (GMT). If your Lat. is off, your Long. is going to be off by varying distances thanks to the Earth's roundness: 1 degree Lat. = 60 nm, constant because they're parallels; 1 degree Long. = 60 nm at the equator - and will decrease as you move towards the north or south poles, to the point where at the poles, your Long. is nothing more than "points" - and the Long. is also calculated by the difference between GMT and local time with that distance being different depending on your Lat. It's been over 12 years since I've done any of this (I'd still be doing it if my back hadn't put be out of action), and longer since doing it on my buoy tender (ca. 1983) so I'm rather rusty, and my living history navigation equipment with a detailed-yet-easy to understand explanation of the above is stashed away... somewhere. But I thought I'd mention that DST needs to be taken into account when using our local "star" for daytime celestial navigation to calculate Lat., or using Polaris for night celestial navigation... just in case my living history group wasn't the only ones that hadn't realized that. (So we can add Celestial Navigation to the list of reasons to do away with DST and leave our fracking clocks alone and on EST/CST/etc. from now on!) Keep looking through that sextant, "and keep looking up!" Dino.
-----Original Message-----
From: George Reynolds via groups.io <pathfinder027@...>
To: BBAA-Group <backbayastro@groups.io>
Sent: Tue, Jan 31, 2023 5:12 pm
Subject: [BackBayAstro] February BBAA Meeting this Thursday Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12. Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation. For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
Back Bay Amateur Astronomers (BBAA)
http://www.backbayastro.org
|
|
|
I’ve had something come up and will not be able to attend tonight, in person or on zoom. Are the meetings archived? If they are what is the link to access them?
On Feb 1, 2023, at 6:15 PM, Roland via groups.io <rolanddowning@...> wrote:
Should I break out my sextant? On Feb 1, 2023, at 4:04 PM, Jeff Goldstein <jeffgold1@...> wrote:
Dino, Sounds like a great story for those not on the groups.io. Please plan on attending tomorrows meeting in person! Jeff G From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of galacticprobe via groups.io
Sent: Wednesday, February 1, 2023 12:42 AM
To: BackBayAstro@groups.io
Subject: Re: [BackBayAstro] February BBAA Meeting this Thursday When I was involved with my nautical living history group we did this demo using the noon sighting. One of our members had an insurance-worthy chronometer from the late 1800s that kept the most accurate time imaginable. At one event we pulled out an actual chart to plot the position - rather than just going through the explanation and showing those who stopped to view the demo how it was done, and what the end resulting Lat. and Long. position was by the numbers - and when we plotted this one we were way off the mark. Thought it was a fluke so we let everyone know that we were going to check the chronometer that evening and try it again the following day. Well, the chronometer was spot on with the Time Tick from Ft. Collins, CO, and when the owner of the chronometer tried it again using celestial plotting with Polaris (the star) his plot was still way off. The following day we scratched our heads over this. Then the noon sighting demo had us way off again. And then someone asked about that accursed Daylight Savings Time. (Face palm and heel-of-the-hand-to-the-forehead moment!) We were shooting the "noon" sighting at 1200 EDT, which was actually 1100 EST! Well, we tried it again at 1300 EDT (1200 EST) and this time the plot put is right on the money. When the sighting with Polaris was tried later that night - this time taking into account the fact that "local" time was an hour ahead of what it should be - the chronometer didn't fail us and using the proper time difference the night sighting put us right where we should be. So, from then on when we explained this sort of navigation during a demo we made sure to add in the effect that Daylight "Sucking" Time had on the noon and night (star) sighting, and how anyone in our modern age going for a sighting would have to do it at 1 PM rather than at 12 PM, and adjust the night sighting by an hour because of the local clocks being an hour ahead of "normal"; when you thought it was noon because "DST" said so, you were actually still an hour away from "normal" noon, and while Polaris at night might give you a correct Lat., you needed a correct local time to get a correct Long. calculation. Just imagine the carnage it would cause if you went back in time to a point before DST was made an annual fixture and set a fleet's ship's clocks ahead an hour. They'd be off by several hundred nautical miles (nm), since Long. is based on your Lat. which is taken and calculated from a noon sighting (provided you're not clouded over), or your angle of Polaris along with the time difference between "local" time and the chronometer's Greenwich Mean Time (GMT). If your Lat. is off, your Long. is going to be off by varying distances thanks to the Earth's roundness: 1 degree Lat. = 60 nm, constant because they're parallels; 1 degree Long. = 60 nm at the equator - and will decrease as you move towards the north or south poles, to the point where at the poles, your Long. is nothing more than "points" - and the Long. is also calculated by the difference between GMT and local time with that distance being different depending on your Lat. It's been over 12 years since I've done any of this (I'd still be doing it if my back hadn't put be out of action), and longer since doing it on my buoy tender (ca. 1983) so I'm rather rusty, and my living history navigation equipment with a detailed-yet-easy to understand explanation of the above is stashed away... somewhere. But I thought I'd mention that DST needs to be taken into account when using our local "star" for daytime celestial navigation to calculate Lat., or using Polaris for night celestial navigation... just in case my living history group wasn't the only ones that hadn't realized that. (So we can add Celestial Navigation to the list of reasons to do away with DST and leave our fracking clocks alone and on EST/CST/etc. from now on!) Keep looking through that sextant, "and keep looking up!" Dino.
-----Original Message-----
From: George Reynolds via groups.io <pathfinder027@...>
To: BBAA-Group <backbayastro@groups.io>
Sent: Tue, Jan 31, 2023 5:12 pm
Subject: [BackBayAstro] February BBAA Meeting this Thursday Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12. Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation. For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
Back Bay Amateur Astronomers (BBAA)
http://www.backbayastro.org
|
|
|
Should I break out my sextant?
On Feb 1, 2023, at 4:04 PM, Jeff Goldstein <jeffgold1@...> wrote:
Dino, Sounds like a great story for those not on the groups.io. Please plan on attending tomorrows meeting in person! Jeff G From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of galacticprobe via groups.io
Sent: Wednesday, February 1, 2023 12:42 AM
To: BackBayAstro@groups.io
Subject: Re: [BackBayAstro] February BBAA Meeting this Thursday When I was involved with my nautical living history group we did this demo using the noon sighting. One of our members had an insurance-worthy chronometer from the late 1800s that kept the most accurate time imaginable. At one event we pulled out an actual chart to plot the position - rather than just going through the explanation and showing those who stopped to view the demo how it was done, and what the end resulting Lat. and Long. position was by the numbers - and when we plotted this one we were way off the mark. Thought it was a fluke so we let everyone know that we were going to check the chronometer that evening and try it again the following day. Well, the chronometer was spot on with the Time Tick from Ft. Collins, CO, and when the owner of the chronometer tried it again using celestial plotting with Polaris (the star) his plot was still way off. The following day we scratched our heads over this. Then the noon sighting demo had us way off again. And then someone asked about that accursed Daylight Savings Time. (Face palm and heel-of-the-hand-to-the-forehead moment!) We were shooting the "noon" sighting at 1200 EDT, which was actually 1100 EST! Well, we tried it again at 1300 EDT (1200 EST) and this time the plot put is right on the money. When the sighting with Polaris was tried later that night - this time taking into account the fact that "local" time was an hour ahead of what it should be - the chronometer didn't fail us and using the proper time difference the night sighting put us right where we should be. So, from then on when we explained this sort of navigation during a demo we made sure to add in the effect that Daylight "Sucking" Time had on the noon and night (star) sighting, and how anyone in our modern age going for a sighting would have to do it at 1 PM rather than at 12 PM, and adjust the night sighting by an hour because of the local clocks being an hour ahead of "normal"; when you thought it was noon because "DST" said so, you were actually still an hour away from "normal" noon, and while Polaris at night might give you a correct Lat., you needed a correct local time to get a correct Long. calculation. Just imagine the carnage it would cause if you went back in time to a point before DST was made an annual fixture and set a fleet's ship's clocks ahead an hour. They'd be off by several hundred nautical miles (nm), since Long. is based on your Lat. which is taken and calculated from a noon sighting (provided you're not clouded over), or your angle of Polaris along with the time difference between "local" time and the chronometer's Greenwich Mean Time (GMT). If your Lat. is off, your Long. is going to be off by varying distances thanks to the Earth's roundness: 1 degree Lat. = 60 nm, constant because they're parallels; 1 degree Long. = 60 nm at the equator - and will decrease as you move towards the north or south poles, to the point where at the poles, your Long. is nothing more than "points" - and the Long. is also calculated by the difference between GMT and local time with that distance being different depending on your Lat. It's been over 12 years since I've done any of this (I'd still be doing it if my back hadn't put be out of action), and longer since doing it on my buoy tender (ca. 1983) so I'm rather rusty, and my living history navigation equipment with a detailed-yet-easy to understand explanation of the above is stashed away... somewhere. But I thought I'd mention that DST needs to be taken into account when using our local "star" for daytime celestial navigation to calculate Lat., or using Polaris for night celestial navigation... just in case my living history group wasn't the only ones that hadn't realized that. (So we can add Celestial Navigation to the list of reasons to do away with DST and leave our fracking clocks alone and on EST/CST/etc. from now on!) Keep looking through that sextant, "and keep looking up!" Dino.
-----Original Message-----
From: George Reynolds via groups.io <pathfinder027@...>
To: BBAA-Group <backbayastro@groups.io>
Sent: Tue, Jan 31, 2023 5:12 pm
Subject: [BackBayAstro] February BBAA Meeting this Thursday Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12. Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation. For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
Back Bay Amateur Astronomers (BBAA)
http://www.backbayastro.org
|
|
|
Jeff Goldstein
Dino, Sounds like a great story for those not on the groups.io. Please plan on attending tomorrows meeting in person! Jeff G
From: BackBayAstro@groups.io <BackBayAstro@groups.io> On Behalf Of galacticprobe via groups.io Sent: Wednesday, February 1, 2023 12:42 AM To: BackBayAstro@groups.io Subject: Re: [BackBayAstro] February BBAA Meeting this Thursday When I was involved with my nautical living history group we did this demo using the noon sighting. One of our members had an insurance-worthy chronometer from the late 1800s that kept the most accurate time imaginable. At one event we pulled out an actual chart to plot the position - rather than just going through the explanation and showing those who stopped to view the demo how it was done, and what the end resulting Lat. and Long. position was by the numbers - and when we plotted this one we were way off the mark. Thought it was a fluke so we let everyone know that we were going to check the chronometer that evening and try it again the following day. Well, the chronometer was spot on with the Time Tick from Ft. Collins, CO, and when the owner of the chronometer tried it again using celestial plotting with Polaris (the star) his plot was still way off. The following day we scratched our heads over this. Then the noon sighting demo had us way off again. And then someone asked about that accursed Daylight Savings Time. (Face palm and heel-of-the-hand-to-the-forehead moment!) We were shooting the "noon" sighting at 1200 EDT, which was actually 1100 EST! Well, we tried it again at 1300 EDT (1200 EST) and this time the plot put is right on the money. When the sighting with Polaris was tried later that night - this time taking into account the fact that "local" time was an hour ahead of what it should be - the chronometer didn't fail us and using the proper time difference the night sighting put us right where we should be. So, from then on when we explained this sort of navigation during a demo we made sure to add in the effect that Daylight "Sucking" Time had on the noon and night (star) sighting, and how anyone in our modern age going for a sighting would have to do it at 1 PM rather than at 12 PM, and adjust the night sighting by an hour because of the local clocks being an hour ahead of "normal"; when you thought it was noon because "DST" said so, you were actually still an hour away from "normal" noon, and while Polaris at night might give you a correct Lat., you needed a correct local time to get a correct Long. calculation. Just imagine the carnage it would cause if you went back in time to a point before DST was made an annual fixture and set a fleet's ship's clocks ahead an hour. They'd be off by several hundred nautical miles (nm), since Long. is based on your Lat. which is taken and calculated from a noon sighting (provided you're not clouded over), or your angle of Polaris along with the time difference between "local" time and the chronometer's Greenwich Mean Time (GMT). If your Lat. is off, your Long. is going to be off by varying distances thanks to the Earth's roundness: 1 degree Lat. = 60 nm, constant because they're parallels; 1 degree Long. = 60 nm at the equator - and will decrease as you move towards the north or south poles, to the point where at the poles, your Long. is nothing more than "points" - and the Long. is also calculated by the difference between GMT and local time with that distance being different depending on your Lat. It's been over 12 years since I've done any of this (I'd still be doing it if my back hadn't put be out of action), and longer since doing it on my buoy tender (ca. 1983) so I'm rather rusty, and my living history navigation equipment with a detailed-yet-easy to understand explanation of the above is stashed away... somewhere. But I thought I'd mention that DST needs to be taken into account when using our local "star" for daytime celestial navigation to calculate Lat., or using Polaris for night celestial navigation... just in case my living history group wasn't the only ones that hadn't realized that. (So we can add Celestial Navigation to the list of reasons to do away with DST and leave our fracking clocks alone and on EST/CST/etc. from now on!) Keep looking through that sextant, "and keep looking up!" Dino.
-----Original Message-----
From: George Reynolds via groups.io <pathfinder027@...>
To: BBAA-Group <backbayastro@groups.io>
Sent: Tue, Jan 31, 2023 5:12 pm
Subject: [BackBayAstro] February BBAA Meeting this Thursday Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12. Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation. For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
Back Bay Amateur Astronomers (BBAA)
http://www.backbayastro.org
|
|
|
galacticprobe
When I was involved with my nautical living history group we did this demo using the noon sighting. One of our members had an insurance-worthy chronometer from the late 1800s that kept the most accurate time imaginable. At one event we pulled out an actual chart to plot the position - rather than just going through the explanation and showing those who stopped to view the demo how it was done, and what the end resulting Lat. and Long. position was by the numbers - and when we plotted this one we were way off the mark. Thought it was a fluke so we let everyone know that we were going to check the chronometer that evening and try it again the following day.
Well, the chronometer was spot on with the Time Tick from Ft. Collins, CO, and when the owner of the chronometer tried it again using celestial plotting with Polaris (the star) his plot was still way off. The following day we scratched our heads over this. Then the noon sighting demo had us way off again. And then someone asked about that accursed Daylight Savings Time. (Face palm and heel-of-the-hand-to-the-forehead moment!) We were shooting the "noon" sighting at 1200 EDT, which was actually 1100 EST!
Well, we tried it again at 1300 EDT (1200 EST) and this time the plot put is right on the money. When the sighting with Polaris was tried later that night - this time taking into account the fact that "local" time was an hour ahead of what it should be - the chronometer didn't fail us and using the proper time difference the night sighting put us right where we should be. So, from then on when we explained this sort of navigation during a demo we made sure to add in the effect that Daylight "Sucking" Time had on the noon and night (star) sighting, and how anyone in our modern age going for a sighting would have to do it at 1 PM rather than at 12 PM, and adjust the night sighting by an hour because of the local clocks being an hour ahead of "normal"; when you thought it was noon because "DST" said so, you were actually still an hour away from "normal" noon, and while Polaris at night might give you a correct Lat., you needed a correct local time to get a correct Long. calculation.
Just imagine the carnage it would cause if you went back in time to a point before DST was made an annual fixture and set a fleet's ship's clocks ahead an hour. They'd be off by several hundred nautical miles (nm), since Long. is based on your Lat. which is taken and calculated from a noon sighting (provided you're not clouded over), or your angle of Polaris along with the time difference between "local" time and the chronometer's Greenwich Mean Time (GMT). If your Lat. is off, your Long. is going to be off by varying distances thanks to the Earth's roundness: 1 degree Lat. = 60 nm, constant because they're parallels; 1 degree Long. = 60 nm at the equator - and will decrease as you move towards the north or south poles, to the point where at the poles, your Long. is nothing more than "points" - and the Long. is also calculated by the difference between GMT and local time with that distance being different depending on your Lat.
It's been over 12 years since I've done any of this (I'd still be doing it if my back hadn't put be out of action), and longer since doing it on my buoy tender (ca. 1983) so I'm rather rusty, and my living history navigation equipment with a detailed-yet-easy to understand explanation of the above is stashed away... somewhere. But I thought I'd mention that DST needs to be taken into account when using our local "star" for daytime celestial navigation to calculate Lat., or using Polaris for night celestial navigation... just in case my living history group wasn't the only ones that hadn't realized that. (So we can add Celestial Navigation to the list of reasons to do away with DST and leave our fracking clocks alone and on EST/CST/etc. from now on!)
Keep looking through that sextant, "and keep looking up!"
Dino.
-----Original Message-----
From: George Reynolds via groups.io <pathfinder027@...>
To: BBAA-Group <backbayastro@groups.io>
Sent: Tue, Jan 31, 2023 5:12 pm
Subject: [BackBayAstro] February BBAA Meeting this Thursday
Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12.
Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation.
For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
|
|
|
Shawn Loescher
Please feel free to bring your family member. Our club meetings are open to the public. See you there.
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|
|
This would be my first meeting, Am I allowed to bring a family member who would also be interested in this, or would they have to be a member?
Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12.
Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation.
For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
|
|
|
Here is the zoom link.
Also, I was a member of the first class of NROTC Midshipman (2002) who did not get taught celestial navigation. This fact really burned members of the 2001 class.
Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12.
Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation.
For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
|
|
|
Please come to the BBAA meeting this Thursday, 2 February at 7:30 pm at Tidewater Community College's Virginia Beach Campus. We meet on the second floor of the Science Building (Building J), in Room JC12.
Our Vice President, Jeff Goldstein, will present our special feature, an explanation and demonstration of Celestial Navigation.
For centuries, sailors used the sun and the stars to navigate across the trackless oceans. The Navy taught it at their training schools. Come and see how it is done.
George
George Reynolds
"Solar System Ambassador" for South Hampton Roads, Virginia
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