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Re: Calculate star rise or set time?
From: Gary LaPook
Date: 2015 Nov 19, 04:02 +0000

It simple. Just rearrange the standard cosine formula for calculating Hc to solve for HLA. Input latitude, declination, altitude of zero and then solve for LHA. Then subtract SHA from LHA to determine the requisite GHA Aries and then look up that GHA Aries in the Nautical Almanac.

From: Samuel L <NoReply_SamuelL@fer3.com>
To: garylapook@pacbell.net
Sent: Wednesday, November 18, 2015 6:15 PM
Subject: [NavList] Calculate star rise or set time?

Is there a simple way to calculate when a star will rise or set as viewed from a specific Longitude? I know that when LHA equals your Longitude the celestial body is on your meridian but I can't seem to figure out how calculate a star's rise and set time.

Thanks,

Sam

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