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Geyser1977-08-19
Arsenic 1800
Colloidal Pool 1200
Congress Pool 1200,  1200
Echinus1207
Emerald Spring 1200
Fearless 1200
Green Dragon Spring 1200
Jetsam Pool 1200
Little Whirligig1345 A, 1610
Mud Spring 1200
Pequito 1800
Sunday 1200
Tantalus 1200
Whirligig0830 ie, 1503, 1830
Yellow Funnel Spring 1200
Values for Old Faithful Area1977-08-19
Astronomical Twilight Begin04:40
Nautical Twilight Begin05:21
Civil Twilight Begin06:00
Sunrise06:31
Sunset20:22
Civil Twilight End20:53
Nautical Twilight End21:31
Astronomical Twilight End22:13
Moon Illumination20.53%

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