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    Re: Using the 2102-D for presetting the sextant.
    From: Greg Rudzinski
    Date: 2011 Aug 4, 17:05 -0700

    For those that have a 2102-D and are averse to marking it up I propose making a disc to attach to the back of the 2102-D (see linked images). Set the disc Aries to the day of the month and the blue template to the zone time. The images show todays civil twilight setting for 35*N. A short cut is to use the red template and plot the Sun. Draw a 5/16 in. circle around the Sun plot then place the circles edge tangent to zero altitude of the blue template to get civil twilight zone time (or LHA of Aries from disc to use in Pub 249 selected stars).

    Greg Rudzinski
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