| Geyser | 1974-09-23 |
|---|---|
| Arsenic | 1030 ie |
| Bear Den | 1047 |
| Constant | 1036, 1408 |
| Echinus | 0854, 1014, 1138, 1431, 1546 |
| Ledge | 1100-1400 |
| Little Whirligig | 1035, 1411 |
| Whirligig | 1145 ie, 1646 |
| Values for Old Faithful Area | 1974-09-23 |
|---|---|
| Astronomical Twilight Begin | 05:33 |
| Nautical Twilight Begin | 06:08 |
| Civil Twilight Begin | 06:42 |
| Sunrise | 07:11 |
| Sunset | 19:19 |
| Civil Twilight End | 19:48 |
| Nautical Twilight End | 20:22 |
| Astronomical Twilight End | 20:57 |
| Moon Illumination | 49.53% |