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Search Results
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Thread: Old no-plotting method for finding Lat and long.
Post: RE: Old no-plotting method for finding Lat and ...
| Have you had an opportunity to try this yet? How did it go? |
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BigBill |
The Sight Reduction process
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7 |
5,725 |
12-19-2021, 03:44 PM |
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Thread: Old no-plotting method for finding Lat and long.
Post: RE: Old no-plotting method for finding Lat and ...
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BigBill |
The Sight Reduction process
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7 |
5,725 |
11-27-2021, 01:43 AM |
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Thread: Sign of the times.
Post: RE: Sign of the times.
| I try to take a sight monthly to stay in practice. Sadly,, life intrudes sometimes. |
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BigBill |
General Topics Here
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1 |
1,965 |
11-27-2021, 01:39 AM |
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Thread: THINK ABOUT IT
Post: RE: THINK ABOUT IT
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I have always assumed the noon sight and a Polaris sight would be good for that. You could at least get latitude pretty well, if use of a timepiece is allowed, longitude follows. Then later, a series... |
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BigBill |
General Topics Here
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12 |
10,150 |
05-16-2021, 03:55 PM |
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Thread: British Mark IXA Bubble Sextant
Post: RE: British Mark IXA Bubble Sextant
| I have a Link A-12 which is a pretty simple, unsophisticated bubble sextant in comparison.
Do you have a manual for it?
I found a PDF online, will put the link below in case it could be of hel... |
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BigBill |
General Topics Here
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2 |
4,235 |
09-28-2020, 06:36 PM |
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Thread: New (to me) Ebbco
Post: RE: New (to me) Ebbco
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LouisC Wrote: (09-06-2020, 12:13 PM)
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BigBill,
Is that the sextant that's similar to the "life-boat" sextant? It's pretty simple if the web pictures are correct.
Is there a telescope or ju... |
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BigBill |
General Topics Here
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3 |
4,900 |
09-06-2020, 01:43 PM |
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Thread: New (to me) Ebbco
Post: New (to me) Ebbco
| I found an Ebbco sextant online for a really great price and had to have it. Everything on it is in top shape except a couple of the shades were darkened to the point of uselessness or someone replace... |
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BigBill |
General Topics Here
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3 |
4,900 |
09-04-2020, 03:38 PM |
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Thread: Bagnold Sun compass- BillOfTheNorth
Post: RE: Bagnold Sun compass- BillOfTheNorth
| Hi Roland,
If I interpret your question correctly, I think you've gotten part of the procedure wrong.
I hope this helps, it's hard to explain without a model of the parts.
Here's the basic drill.
T... |
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BigBill |
General Topics Here
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1 |
4,093 |
05-25-2019, 03:27 PM |
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Thread: Assumed Position: adjustment necessary when using calculator?
Post: RE: Assumed Position: adjustment necessary when u...
| I don't know the answer to your question but maybe you could take several sightings and figure them both ways. if your results are close you might have your answer. |
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BigBill |
The Sight Reduction process
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4 |
6,158 |
05-08-2019, 08:33 PM |
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Thread: The North Pole no longer wanders - it runs
Post: RE: The North Pole no longer wanders - it runs
| Of course it has always moved but now appears to be accelerating. I found a few years ago that the declination of my old yopo maps was off by 2 or 3 degrees. It will be interesting to see what happen... |
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BigBill |
The Sight Reduction process
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7 |
10,705 |
01-31-2019, 03:33 PM |
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Thread: Last time
Post: RE: Last time
| Sorry to see you go. Sadly, modern life has a way of getting in the way despite innovations in communications. In days past a letter in the mail would have been treated and responded to with more grav... |
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BigBill |
The Sight Reduction process
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2 |
4,565 |
11-26-2018, 04:21 PM |
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Thread: What Time is it?
Post: RE: What Time is it?
| Might this be it?
https://en.wikipedia.org/wiki/BPM_(time_service)
BPM is the call sign of the official short-wave time signal (https://en.wikipedia.org/wiki/Time_signal) service of the People's... |
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BigBill |
General Topics Here
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15 |
24,880 |
10-26-2018, 03:01 AM |
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Thread: What Time is it?
Post: RE: What Time is it?
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pabrides Wrote: (10-04-2018, 08:28 AM)
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...BigBill has a transit instrument at his house with which he observes the passing of certain stars over his meridian. He keeps a well maintained clock in ... |
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BigBill |
General Topics Here
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15 |
24,880 |
10-04-2018, 01:39 PM |
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Thread: What Time is it?
Post: RE: What Time is it?
| Time signals are hard to hear though I suppose if I listened better and more often I might get the hang of it. |
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BigBill |
General Topics Here
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15 |
24,880 |
10-02-2018, 02:13 AM |
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Thread: What Time is it?
Post: RE: What Time is it?
| time.nist.gov is where I go to update my computer time. I usually do it right before I set or check my watch to take a few sights. I have no idea how close it is to actual GMT. Can't be more than a fe... |
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BigBill |
General Topics Here
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15 |
24,880 |
09-30-2018, 03:49 AM |
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Thread: Nories tables?
Post: RE: Nories tables?
| Cool, thanks for the reply. I guess Celestaire has updated them (as of 2007). Not knowing anything about the tables or how to use them I was wondering if they are as accurate as claimed. |
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BigBill |
General Topics Here
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3 |
6,254 |
09-08-2018, 03:31 PM |
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Thread: Nories tables?
Post: Nories tables?
| The Nories tables sounds intriguing, precision to 1/10th of a minute. I've never heard of them before and was cruising through the Celestaire catalog when I ran across the book for sale. Just wonderi... |
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BigBill |
General Topics Here
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3 |
6,254 |
09-07-2018, 10:01 PM |
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Thread: First time real horizon
Post: RE: First time real horizon
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pabrides Wrote: (08-18-2018, 08:35 AM)
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After reducing your data Im thinking you were near Nordhouse dunes or maybe Ludington state park.... Google lat/long is not that reliable. Their map says y... |
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BigBill |
General Topics Here
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5 |
8,267 |
08-18-2018, 01:18 PM |
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Thread: First time real horizon
Post: RE: First time real horizon
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EdCa Wrote: (07-25-2018, 09:15 PM)
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BigBill,
What a clever sextant the Mark 3 is! You weren't far off in your sights. They were close enough. Did you find the mirror moved a lot and that's wh... |
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BigBill |
General Topics Here
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5 |
8,267 |
07-26-2018, 01:19 AM |
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Thread: First time real horizon
Post: First time real horizon
| On July 7th we took a trip to the beach and I was able to use the natural horizon on Lake Michigan for a series of afternoon sun sights. This is the first time I've been able to use other than an arti... |
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BigBill |
General Topics Here
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5 |
8,267 |
07-21-2018, 03:43 PM |
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Thread: LOP plotting question
Post: RE: LOP plotting question
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BigBill |
General Topics Here
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11 |
14,485 |
06-30-2018, 04:32 AM |
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Thread: LOP plotting question
Post: RE: LOP plotting question
| Diagrams would sure help in a discussion like this. :) |
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BigBill |
General Topics Here
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11 |
14,485 |
06-29-2018, 02:35 PM |
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Thread: LOP plotting question
Post: LOP plotting question
| When you plot your TOWARD or AWAY distance, do you account for the change in distance between degrees of longitude? For instance, if you were plotting T or A of 10' east to west, do you plot it at th... |
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BigBill |
General Topics Here
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11 |
14,485 |
06-22-2018, 03:33 AM |
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Thread: Video- Concise Sight Reduction Tables
Post: RE: Video- Concise Sight Reduction Tables
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EdCa Wrote: (03-22-2018, 09:30 PM)
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BigBill,
People give their souls to Youtube. Good for you!
Better days....
Ed
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I'll leave the old videos up for a while yet. |
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BigBill |
The Sight Reduction process
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8 |
12,979 |
03-23-2018, 02:55 PM |
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Thread: Video- Concise Sight Reduction Tables
Post: RE: Video- Concise Sight Reduction Tables
| Due to youtube's policies I have moved the video to a different venue.
It can now be found at: https://www.bitchute.com/video/FJqnhTCNvQHk/ |
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BigBill |
The Sight Reduction process
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8 |
12,979 |
03-22-2018, 01:37 PM |
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Thread: Video- Concise Sight Reduction Tables
Post: RE: Video- Concise Sight Reduction Tables
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LouisC Wrote: (03-12-2018, 11:53 PM)
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Bill,
That's a great presentation you did. Pardon my lack of knowledge but can the Concise Sight Reduction be performed for all celestial bodies? I'll nee... |
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BigBill |
The Sight Reduction process
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8 |
12,979 |
03-14-2018, 04:22 AM |
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Thread: Davis Mark 15 & 25
Post: RE: Davis Mark 15 & 25
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craigsl Wrote: (03-08-2018, 01:17 AM)
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From what I can tell there isn't much difference in overall size between the Mark 15 and the Mark 25 sextants. They look the same.
Craig
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It seeme... |
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BigBill |
General Topics Here
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5 |
8,044 |
03-08-2018, 01:53 PM |
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Thread: Davis Mark 15 & 25
Post: RE: Davis Mark 15 & 25
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craigsl Wrote: (03-05-2018, 08:49 PM)
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BigBill,
I measured the beam converger mirror on my Mark 15.
Width- 1.142" (how do you like that for accuracy?)
Height- 1-5/8" (had to measure the ... |
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BigBill |
General Topics Here
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5 |
8,044 |
03-07-2018, 11:02 PM |
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Thread: Davis Mark 15 & 25
Post: Davis Mark 15 & 25
| I was wondering if the Mark 25 "beam converging" mirror can be retrofitted to the Mark 15.
Davis says the split mirror of the Mark 15 can be fitted to the 25. The dimensions for the replacement part... |
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BigBill |
General Topics Here
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5 |
8,044 |
03-05-2018, 01:20 AM |
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Thread: Just trying to be nice
Post: RE: Just trying to be nice
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BigBill |
General Topics Here
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3 |
6,285 |
12-24-2017, 03:23 PM |
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Thread: A,B, P etc
Post: RE: A,B, P etc
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Rumata Wrote: (11-12-2017, 08:19 PM)
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BigBill Wrote: (11-12-2017, 04:35 PM)
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Does anyone know or have a link that explains what exactly the values for A,B, F, P etc represent in a sight reductio... |
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BigBill |
General Topics Here
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5 |
9,526 |
11-13-2017, 12:30 AM |
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Thread: A,B, P etc
Post: A,B, P etc
| Does anyone know or have a link that explains what exactly the values for A,B, F, P etc represent in a sight reduction?
I was asked recently and I know anything with H has to do with altitudes and... |
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BigBill |
General Topics Here
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5 |
9,526 |
11-12-2017, 04:35 PM |
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Thread: Analog or Digital time display
Post: RE: Analog or Digital time display
| I agree with Carlos.
I have a GPS sporting watch which updates the times automatically whenever I connect to the system. I'm able to display two different time zones. My home zone and London England... |
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BigBill |
General Topics Here
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2 |
6,091 |
10-27-2017, 06:27 PM |
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Thread: Sighting the eclipse
Post: RE: Sighting the eclipse
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c_davidson Wrote: (08-21-2017, 10:45 PM)
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BigBill Wrote: (08-21-2017, 09:22 PM)
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I was able to see it well.
I wonder if the eclipse bends the light somewhat. I took a number of sun sights dur... |
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BigBill |
General Topics Here
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4 |
7,201 |
08-22-2017, 04:31 AM |
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Thread: Sighting the eclipse
Post: RE: Sighting the eclipse
| I was able to see it well.
I wonder if the eclipse bends the light somewhat. I took a number of sun sights during the event but so far have only reduced two of them. They are both off by 20+ miles.... |
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BigBill |
General Topics Here
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4 |
7,201 |
08-21-2017, 09:22 PM |
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Thread: Sighting the eclipse
Post: Sighting the eclipse
| I'm thinking I might try and take a sextant sighting of the sun (and moon) during the eclipse. It could be interesting.
I hope the clouds stay out of the way. |
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BigBill |
General Topics Here
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4 |
7,201 |
08-21-2017, 03:37 PM |
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Thread: How to buy a sextant
Post: RE: How to buy a sextant
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BigBill |
General Topics Here
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8 |
16,736 |
08-13-2017, 11:16 PM |
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Thread: How to buy a sextant
Post: RE: How to buy a sextant
| I've heard the Mark 3s are as accurate if not more so than the Mark 15 or 25 and at least with mine that seems to be the case.
P.Rutherford Wrote: (08-10-2017, 08:35 PM)
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James,
If it's any h... |
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BigBill |
General Topics Here
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8 |
16,736 |
08-11-2017, 03:18 PM |
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Thread: Electronic Sextant G-Stell
Post: RE: Electronic Sextant G-Stell
| It does look interesting. Sadly, like a GPS it takes all of the work and thus, all of the fun out of it. :) |
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BigBill |
General Topics Here
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3 |
7,556 |
07-09-2017, 03:51 PM |
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Thread: This is a great resource
Post: This is a great resource
| Despite the lack of activity in the forums, I wanted to express my appreciation for everything here. I use the almanac regularly and have learned a lot from the information presented. |
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BigBill |
General Topics Here
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1 |
4,755 |
06-02-2017, 02:59 PM |
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Thread: Great Circle route difficulty
Post: RE: Great Circle route difficulty
| I got it figured out. Just a couple of dumb mistakes I was making in the almanac. f was about 94° and I wasn't reading back up to the value thinking it stopped at 90°, at an f greater than 90° z2 bec... |
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BigBill |
General Topics Here
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4 |
8,695 |
04-28-2017, 04:11 PM |
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Thread: Great Circle route difficulty
Post: RE: Great Circle route difficulty
| I don't use a calculator, I run through the tables or do the basic math.
The procedure as described was the the Lat of the destination is the Declination, the Longitude of destination is the GHA an... |
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BigBill |
General Topics Here
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4 |
8,695 |
04-25-2017, 01:48 PM |
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Thread: Great Circle route difficulty
Post: Great Circle route difficulty
| I was brushing up on the procedure for figuring the great circle route, the one in the 50 year almanac by Kolbe and had some troubles. Maybe I was just tired and the tv was on but 2 attempts at fairl... |
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BigBill |
General Topics Here
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4 |
8,695 |
04-22-2017, 08:22 PM |
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Thread: Moon & Jupiter April 11
Post: RE: Moon & Jupiter April 11
| I wish I could have, we've been clouded up the last few nights. |
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BigBill |
General Topics Here
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2 |
5,043 |
04-12-2017, 06:17 PM |
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Thread: Moon alt correction with AH
Post: RE: Moon alt correction with AH
| Thanks Roland,
I was just doing something similar the other day with some old moon sights I took a couple of years back. What was interesting was that I didn't recall the lat/ long where I had taken ... |
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BigBill |
The Sight Reduction process
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4 |
6,551 |
04-05-2017, 07:58 PM |
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Thread: Moon alt correction with AH
Post: Moon alt correction with AH
| Can I assume the procedure is the same as the bubble sextant when using an AH? |
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BigBill |
The Sight Reduction process
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4 |
6,551 |
04-05-2017, 03:30 PM |
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Thread: Fun day on the deck
Post: RE: Fun day on the deck
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P.Rutherford Wrote: (04-04-2017, 11:23 AM)
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Bigbill,
Do you use the recording drum on the A12? I know there is one but I've never known how they work.
Paul.
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I don't. In fact I remove it sinc... |
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BigBill |
General Topics Here
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4 |
7,499 |
04-04-2017, 02:57 PM |
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Thread: Fun day on the deck
Post: RE: Fun day on the deck
| I have a Link A12 made for use in aircraft. It's not too bad but I find it best to be sitting when I take a sight and I do everything slowly otherwise I end up trying to chase the sun, star etc and mo... |
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BigBill |
General Topics Here
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4 |
7,499 |
04-04-2017, 04:55 AM |
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Thread: Fun day on the deck
Post: Fun day on the deck
| I spent a nice sunny day today plotting some sights I took of Arcturus and Jupiter the other night and then a sun sight today. They all plotted exceptionally tightly for my bubble sextant.
And since... |
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BigBill |
General Topics Here
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4 |
7,499 |
04-02-2017, 09:58 PM |
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Thread: v for the sun
Post: RE: v for the sun
| I understood that the v correction was built in to the GHA for the sun.
True or no? |
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BigBill |
The Sight Reduction process
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6 |
9,631 |
03-31-2017, 03:14 PM |
