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    Re: Haversines with Logarithms
    From: David C
    Date: 2020 Oct 19, 14:14 -0700

    Further to comments about right ascension.

    Remember that the time sight formula does not give LHA. It gives the meridian angle t which is measured east or west from noon.  LHA is measured west.

    AM   LHA = 360 - t

    PM  LHA = t

    Right ascension is measured east from aries. Before the introduction of the GHA almanac in the early 1950s the almanac gave RA and  EOT. For one or two decades (1930/40s ??) the almnac gave instead factors R and E which were RA and EOT with +- 12 hours added. The GHA almanac makes things very easy.

       
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