| Geyser | 1973-05-15 |
|---|---|
| Beehive | 1040 |
| Castle | 1325 |
| Grand | 1250, 2045 |
| Lion | 0819, 1051, 1327, 1539 |
| Old Faithful | 0818, 0926, 1046, 1151, 1305, 1420, 1515, 1626, 1735, 1842 |
| Values for Old Faithful Area | 1973-05-15 |
|---|---|
| Astronomical Twilight Begin | 03:48 |
| Nautical Twilight Begin | 04:38 |
| Civil Twilight Begin | 05:21 |
| Sunrise | 05:55 |
| Sunset | 20:43 |
| Civil Twilight End | 21:17 |
| Nautical Twilight End | 22:00 |
| Astronomical Twilight End | 22:50 |
| Moon Illumination | 96.39% |