NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2012 Apr 20, 14:51 -0700
Randall Morrow's post mentioning "tax day" reminded me that I meant to make a post on April 15 (which, for the non-US readers, is traditionally tax filing day in the US though this year it was bumped to April 17). April 15 is also an important day in the navigation calendar because this is the day when the apparent Sun finally catches up with the mean Sun and the Equation of Time swings from negative to positive again for a couple of months after its long winter slumber. It looks like this year EqT was zero right around 0400 GMT on April 15. At that time the Sun's GHA on the hour was an exact multiple of 15 degrees. Today, just five days later, the apparent Sun is already 16 to 19 minutes of arc in longitude ahead of the mean Sun. The apparent Sun is "fast", ahead of the Sun, until about 2000 GMT on June 12 when the GHA is once again an exact multiple of 15 degrees right on the hour.
-FER
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