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    Practice Horizon Bubble
    From: Charles McElhill
    Date: 2016 Jul 26, 08:43 -0700

    Quick question regarding use of Celestaire practice bubble.  Purchased one of these to practice with due to the lack of a readily available shoreline.  In the Nautical Almanac, in the table for moon altitude corrections, noticed a small paragraph in the lower right, stating that if you use a bubble horizon, you should neglect the dip correction and subtract 15' for your reading.  My queston is,would this apply to this particular practice bubble horizon, or is this for a more sophisticated bubble type horizon.  Apologies if this question has been asked before.  thanks!

       
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