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    Re: Polhemus computer
    From: Frank Reed
    Date: 2017 Aug 6, 00:20 -0700

    Gary LaPook, you wrote:

    BTW, are you sure that you carried two volumes of HO 229 for working sun and moon and planets?
    HO 229 is a 6 volume set with each volume covering only 15 degrees of latitude. Maybe you carried volumes 2 and 3 of HO 249 which [covered] all latitudes instead.

    I would say that this is almost certainly the case. Of course, the separate volumes 2 and 3 of publication 249 were so different from the delightfully simple volume 1 that it's easy to mistake them for an entirely different publication. In any case, 229 wasn't available in the early 1960s, and its precision was overkill even for marine navigation ...never mind air navigation.

    Frank Reed

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