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    Celestial nav app for iPhone
    From: Paul Dolkas
    Date: 2012 Apr 10, 22:55 -0700

    Has anybody had experience with "Celestial" by Navimatics? It's a relatively inexpensive ($15 or so) app for iPhones. Among other features, it has a sky map and will do sight reductions. It's kinda neat in that you can take it with you on your phone wherever you go.

    I am a little suspicious of the accuracy sight reductions however. Just for fun, I decided to try reducing a set of sightings using it vs. the NA tables. I took about 6 or so sightings on the sun, and then a similar number on the moon. What I was expecting is that the LOP for each set would remain the same (more or less), but instead the LOP offset distance would consistently change with the sun (and moon) elevation. My NA reductions on the other hand had no such trend.

    $15 for a nav app seems too good to be true - I'm afraid I'm getting what I paid for.

    -Paul
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