| Geyser | 1977-08-03 |
|---|---|
| Bear Den | 0917, 1705 |
| Constant | 1020 |
| Echinus | 0910 |
| Little Whirligig | 0915, 1515 |
| Valentine | 0850 |
| Values for Old Faithful Area | 1977-08-03 |
|---|---|
| Astronomical Twilight Begin | 04:11 |
| Nautical Twilight Begin | 04:58 |
| Civil Twilight Begin | 05:39 |
| Sunrise | 06:12 |
| Sunset | 20:46 |
| Civil Twilight End | 21:19 |
| Nautical Twilight End | 22:00 |
| Astronomical Twilight End | 22:47 |
| Moon Illumination | 83.01% |