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Old 18-10-2011, 22:53   #61
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Re: Celestial Navigation Help Needed

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Originally Posted by Vasco View Post
Interesting, didn't think they'd keep that going. Does the Second Mate wind all the ship's clocks every Sunday too?

He changes the battery when they go flat, I haven't seen a wind up clock in years....
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Old 19-10-2011, 04:39   #62
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Re: Celestial Navigation Help Needed

I have one aboard my vessel, but she is so inaccurate I wouldn't dare use it for navigation.
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Old 19-10-2011, 21:37   #63
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Re: Celestial Navigation Help Needed

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Originally Posted by Jimbo485 View Post
4 seconds of time is 1 minute of distance (ie. 1 mile). So your error is 0.00675 miles. FA.
4 seconds of time is a minute of longitude.
Close to the poles, it is a fraction of an inch.

At lat = 0, then it would be a mile.

Just a though.
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Old 21-10-2011, 10:00   #64
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Re: Celestial Navigation Help Needed

hello there,

is there any link to download polaris (pole star) tables in pdf.

i downloaded nautical almanac from this site

navsoft.com/almanac.html

but there is no tables for polaris sight

thanks
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Old 21-10-2011, 10:37   #65
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Re: Celestial Navigation Help Needed

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Originally Posted by epilot10 View Post
4 seconds of time is a minute of longitude.
Close to the poles, it is a fraction of an inch.

At lat = 0, then it would be a mile.

Just a though.
Even a years worth of error will allow me to hit a 50mile Dia island.
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Old 21-10-2011, 10:40   #66
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Re: Celestial Navigation Help Needed

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Originally Posted by gravosa View Post
hello there,

is there any link to download polaris (pole star) tables in pdf.

i downloaded nautical almanac from this site

navsoft.com/almanac.html

but there is no tables for polaris sight

thanks
Isn't Polaris a straight sight angle? I.E. at (north pole = 90, at equator = 0) - altitude of observer.
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Old 21-10-2011, 10:55   #67
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Re: Celestial Navigation Help Needed

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Originally Posted by capn_billl View Post
Isn't Polaris a straight sight angle? I.E. at (north pole = 90, at equator = 0) - altitude of observer.
Not quite, Polaris orbits a circle around the celestial pole
See
Convert A Polaris Sight To Latitude
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Old 10-11-2011, 13:19   #68
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Re: Celestial Navigation Help Needed

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Originally Posted by gravosa View Post
hello there,

is there any link to download polaris (pole star) tables in pdf.

i downloaded nautical almanac from this site

navsoft.com/almanac.html

but there is no tables for polaris sight

thanks
If you still need/want the Polaris Correction tables, let me have an email address and I'll send you scanned copies from the 2011 Admiralty Nautical Almanac, I'm back at work and now have the book to hand
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