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Geyser1973-09-30
Bear Den1645
Blue Mud Steam Vent 1200
Congress Pool 1630
Dabble 1000,  1200
Green Dragon Spring 1000
Ledge 1630
Mystic Spring 1000
Orby 1000,  1200
Puff-n-Stuff 1200
Sunday 1630
Whirligig 1630
Yellow Funnel Spring 1000
Values for Old Faithful Area1973-09-30
Astronomical Twilight Begin05:43
Nautical Twilight Begin06:17
Civil Twilight Begin06:51
Sunrise07:20
Sunset19:06
Civil Twilight End19:35
Nautical Twilight End20:08
Astronomical Twilight End20:43
Moon Illumination14.02%

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