| Geyser | 1983-07-18 |
|---|---|
| Dog's Leg Spring | 1449 ie |
| Echinus | 1337 ie, 1457, 1535, 1607 |
| Steamboat | 1200 |
| Whirligig | 1700 |
| Yellow Funnel Spring | 1200 |
| Values for Old Faithful Area | 1983-07-18 |
|---|---|
| Astronomical Twilight Begin | 03:40 |
| Nautical Twilight Begin | 04:35 |
| Civil Twilight Begin | 05:20 |
| Sunrise | 05:55 |
| Sunset | 21:03 |
| Civil Twilight End | 21:38 |
| Nautical Twilight End | 22:23 |
| Astronomical Twilight End | 23:18 |
| Moon Illumination | 61.9% |