# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Longitude by unequal altitudes - Brent
From: David C
Date: 2020 Jul 6, 21:53 -0700

Brent give an example of the double altitude method. I can get the correct answer but do not understand why. The correction formula should give a value of 2m36 sec - see the image. The input data is a mix of arc seconds and seconds of time. If I convert 77.5 min to seconds of time the result of the formula is  0.0433 but what are the units?

If I do a sexagesimal conversion on my calculator the answer is 0° 2' 36". These numbers are identical to the  2m 36 sec time correction but  2m 36sec is 0° 39' of arc.

I am thoroughly confused...........

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