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NASA’s REPORT ON THE ECLIPSE

Posted on February 26th, 2017 by Don Cerow

               NASAs REPORT ON THE ECLIPSE 


This interactive Google map [1] shows the path of the Annular Solar Eclipse of 2017 Feb 26 . The northern and southern path limits are blue and the central line is red. You MUST be somewhere within the central path (between the blue lines) to see the annular phase of the eclipse. The eclipse is longest on the central line (red). The yellow lines crossing the path indicate the time and position of maximum eclipse at 10-minute intervals.

The green marker labeled GE is the point of Greatest Eclipse. The magenta marker labeled GD is the point of Greatest Duration. This is the location where the annular eclipse lasts the longest along the entire path. In this case, the Greatest Duration is 01m22.4s . This prediction does not take into account the mountains and valleys along the edge of the Moon. For the sake of speed and simplicity, the effects of the lunar limb profile are NOT used in the predictions and map presented on this page.

You can be hundreds of miles from the theoretical point of Greatest Duration and still enjoy annularity lasting within a fraction of a second of the maximum possible (as long as you stay within several miles of the central line). It’s much more important to watch the weather forecasts a day or two before the eclipse and choose a location with the best chance of a cloud-free sky during the eclipse. Good weather is the key to successful eclipse viewing – better to see a shorter eclipse from clear sky that a longer eclipse under clouds [2].

To continue with this column and turn on the interactive functions from the NASA page on eclipses, click here.



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