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    Reeds (not Frank's) Astro tables
    From: David McN
    Date: 2022 Aug 5, 03:43 -0700

    I don't want to sound like a broken record so this will be my final post on the joys of the Reeds Astro tables.  With the premise that I'm a yachtie, with limited space down below, with limited faith in electronics in a yacht and with the experience that most navigation on a yacht is done by dead reckoning, then coastal pilotage, then cel nav: Reeds is magnificent. 

    Three key advantages are:

    1, The book is lightweight and stapled at the spine so it opens flat. It contains both almanac data and sight reduction tables, planet notes, star charts.

    2. It uses the versine formula and hence allows sight reduction calculations from the DR position rather than an assumed position.

    3. By including log sin and log cos tables, all plane sailing calculations can be done.You need to be able to work out a log tan by inspection from log sin and log cos values, but this is straightforward with a little practice. Diff longitude to departure is easy.  

    I've compared sight reduction methods for a given sight and location and there is no perceptible difference in accuracy but there there is material advantage in practicality with Reeds.  I should point out, I'm not associated with the publisher in any way. I just want fellow yachties to know about this almanac.

    I've tried many different methods of cel nav, but I always come back to Reeds. 

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