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Echinus1021, 1129, 1236, 1451 A, 1558,  1800
Little Whirligig 1045
Orby 1800
Whirligig 1745
Yellow Funnel Spring 1800
Values for Old Faithful Area1973-09-17
Astronomical Twilight Begin05:26
Nautical Twilight Begin06:02
Civil Twilight Begin06:36
Civil Twilight End19:58
Nautical Twilight End20:32
Astronomical Twilight End21:08
Moon Illumination76.33%

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