| Geyser | 1974-07-28 |
|---|---|
| Abuse Spring | 0000 A |
| Constant | 1145 |
| Echinus | 0904, 1211, 1354, 1711 |
| Ledge | 1851 |
| Little Whirligig | 1800 |
| Steamboat | 0845 |
| Valentine | 1603 |
| Whirligig | 1800 |
| Values for Old Faithful Area | 1974-07-28 |
|---|---|
| Astronomical Twilight Begin | 03:59 |
| Nautical Twilight Begin | 04:49 |
| Civil Twilight Begin | 05:31 |
| Sunrise | 06:05 |
| Sunset | 20:53 |
| Civil Twilight End | 21:27 |
| Nautical Twilight End | 22:10 |
| Astronomical Twilight End | 23:00 |
| Moon Illumination | 70.78% |