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Arch Steam Vent0000,  1800
Bear Den0925
Congress Pool 1800
Echinus0913, 1113, 1210, 1310, 1404, 1520, 1625
Ledge 1800
Little Whirligig 1800
Orby 1800
Pinto1115 ie, 1934
Pinwheel 1800
Valentine0830, 1910
Values for Old Faithful Area1974-08-15
Astronomical Twilight Begin04:32
Nautical Twilight Begin05:15
Civil Twilight Begin05:54
Civil Twilight End21:00
Nautical Twilight End21:39
Astronomical Twilight End22:22
Moon Illumination9.56%

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