| Geyser | 1977-01-12 |
|---|---|
| Beehive | 1410 |
| Dome | 0000-2359 |
| Grand | 1015 |
| Old Faithful | 0948, 1053 short, 1207 long, 1319 long, 1428 long, 1540 long, 1654 long |
| Riverside | 1050 |
| Spiteful | 1049 |
| Values for Old Faithful Area | 1977-01-12 |
|---|---|
| Astronomical Twilight Begin | 06:13 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:25 |
| Sunrise | 07:57 |
| Sunset | 17:06 |
| Civil Twilight End | 17:38 |
| Nautical Twilight End | 18:14 |
| Astronomical Twilight End | 18:49 |
| Moon Illumination | 56.06% |