| Geyser | 1977-08-06 |
|---|---|
| Constant | 1550 |
| Echinus | 1510 |
| Little Whirligig | 0810 ie, 1552 |
| Valentine | 1634 |
| Values for Old Faithful Area | 1977-08-06 |
|---|---|
| Astronomical Twilight Begin | 04:16 |
| Nautical Twilight Begin | 05:02 |
| Civil Twilight Begin | 05:43 |
| Sunrise | 06:16 |
| Sunset | 20:42 |
| Civil Twilight End | 21:14 |
| Nautical Twilight End | 21:55 |
| Astronomical Twilight End | 22:41 |
| Moon Illumination | 55.89% |