| Geyser | 1973-09-17 |
|---|---|
| Echinus | 1021, 1129, 1236, 1451 A, 1558, 1800 |
| Little Whirligig | 1045 |
| Orby | 1800 |
| Whirligig | 1745 |
| Yellow Funnel Spring | 1800 |
| Values for Old Faithful Area | 1973-09-17 |
|---|---|
| Astronomical Twilight Begin | 05:25 |
| Nautical Twilight Begin | 06:01 |
| Civil Twilight Begin | 06:35 |
| Sunrise | 07:04 |
| Sunset | 19:30 |
| Civil Twilight End | 19:59 |
| Nautical Twilight End | 20:34 |
| Astronomical Twilight End | 21:09 |
| Moon Illumination | 76.33% |