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    Re: Planning a fix with >45 degrees intersection inLOPs
    From: Brad Morris
    Date: 2016 Jan 26, 19:14 -0500

    Hi David

    You can also do it quite readily with the 2102D.  The azimuths to each body are readily estimated given the graduations on the clear blue overlay.  So you can tell which stars will do so for your twilight period.

    However, the original question was how to do it with "Celestial Tools", which means neither of our answers are satisfactory.  That goes for using the USNO website too!  ;-)


    On Jan 26, 2016 3:52 PM, "David Pike" <NoReply_DavidPike@fer3.com> wrote:

    In the Vulcan, we were looking for a close to 90 cut.  In pre PC and smart phone days, we just used the sky diagrams in the Air Almanac.  They always worked fine for us.  On the diagrams pages, you just got star numbers, you had to find the names elsewhere, but you did get stellar magnitude, which was quite important.  It was no good having a perfect cut if you were going to have difficulty seeing the star.  I believe the UK Air Almanac is a much thinner volume these days, but the US Air Almanac is still the same.  You can download it free at http://aa.usno.navy.mil/publications/reports/aira16_all.pdf .  (downloadable in about 30 seconds)  You need the pages starting at A24 though to A121.  They’re about 9/10 of the way through. 

    With a PC it's easy. With'Navigator'  http://www.tecepe.com.br/nav/ , which I use occasionally although there must be many other programmes, you can generate a sky diagram for any place any time almost instantly.  DaveP

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