| Geyser | 1977-07-12 |
|---|---|
| Africa | 1800 |
| Arsenic | 1800 |
| Black Growler | 1800 |
| Blue | 1800 |
| Constant | 1800 |
| Echinus | 1058, 1203, 1343 |
| Fireball | 1800 |
| Valentine | 0805 |
| Whirligig | 1800 |
| Values for Old Faithful Area | 1977-07-12 |
|---|---|
| Astronomical Twilight Begin | 03:31 |
| Nautical Twilight Begin | 04:28 |
| Civil Twilight Begin | 05:14 |
| Sunrise | 05:50 |
| Sunset | 21:07 |
| Civil Twilight End | 21:43 |
| Nautical Twilight End | 22:29 |
| Astronomical Twilight End | 23:26 |
| Moon Illumination | 14.98% |