| Geyser | 1977-08-01 |
|---|---|
| Dabble | 0900 |
| Echinus | 0850, 0955 ?, 1627 |
| Little Whirligig | 1030, 1400 |
| Values for Old Faithful Area | 1977-08-01 |
|---|---|
| Astronomical Twilight Begin | 04:07 |
| Nautical Twilight Begin | 04:55 |
| Civil Twilight Begin | 05:37 |
| Sunrise | 06:10 |
| Sunset | 20:48 |
| Civil Twilight End | 21:21 |
| Nautical Twilight End | 22:03 |
| Astronomical Twilight End | 22:51 |
| Moon Illumination | 95.77% |