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    Re: An All-Haversine Azimuth (from Lat, Dec and dLon alone)?
    From: David C
    Date: 2021 Feb 20, 13:57 -0800

    Tony wrote

    I'm looking for a formula, for an All-Haversine one, which I enter with the Lat, Dec (or LatDest) and dLon to obtain - in one go, no matter how long or complicated, - the initial azimuth.

    In another thread I boasted that I had all three volumes of the Amiralty Manual of Navigation 1938 so  I decided to  check the ADM. Here are  five pages from 1938 volume 2. This is the volume that reached me despite covid. I have not checked the maths but it may be what you want. The equation is not All Haversine - is there such a thing?

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