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    Re: Noon Fix--A couple of questions
    From: Greg Rudzinski
    Date: 2011 Sep 11, 09:59 -0700


    The NOAA Solar Position Calculator should help you out.


    When using the Nautical Almanac daily pages go to the lower right portion of the page to get the Sun's meridional passage time to the nearest minute or equation of time which requires interpolation for UT of MP to get equation of time to the second. If you are just making LAN observations of the Sun then the nearest minute is good enough. You will then need to correct for difference of longitude between the observers longitude and the zone meridian using the arc to time table in the back of the Nautical Almanac. If you are anywhere near the Liberty Bell in Philly then you are almost exactly on the zone meridian 75* west so you can observe LAN at the time listed in the NA with the addition of one hour for day light savings. For today that would be 12:57 EDT (16:57 UT) for LAN at Philadelphia. Using the linked calculator the exact time of LAN is 12:57:18 EDT for Latitude 39* 57' N Longitude 75* 9' W.
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