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    Re: 2016, June 14th Mars Lunars
    From: Antoine Couëtte
    Date: 2016 Jun 19, 10:51 -0700

    Dear Dave,

    You wrote "But, there are equations in sources like Chavenant which let you calculate the parallax in azimuth effect without doing the 3D vector calculation."

    Most of the time, the parrallax in azimuth is extremely negligible, we all agree on that, don't we ?

    Still I would be interested to know whether such Chavenant equations correctly tackle the extreme case when the parallax in Azimut is equal to +/- 180 ° (see enclosed scanned drawing). What are these formulae ?

    Best and Friendly Navigational Regards,

    Kermit



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