| Geyser | 1991-07-30 |
|---|---|
| Echinus | 1035, 1135, 1237, 1337 maj, 1530 |
| Guardian | 1526 |
| Ledge Spring | 1630 |
| Steamboat | 1200 |
| Valentine | 1527 |
| Whirligig | 0955, 1020, 1420, 1515 |
| Values for Old Faithful Area | 1991-07-30 |
|---|---|
| Astronomical Twilight Begin | 04:02 |
| Nautical Twilight Begin | 04:51 |
| Civil Twilight Begin | 05:34 |
| Sunrise | 06:07 |
| Sunset | 20:51 |
| Civil Twilight End | 21:25 |
| Nautical Twilight End | 22:07 |
| Astronomical Twilight End | 22:56 |
| Moon Illumination | 88.76% |