| Geyser | 1975-12-30 |
|---|---|
| Beehive | 1226 |
| Dome | 0000-1200 |
| Giantess | 1505 |
| Grand | 1710 |
| Old Faithful | 0919 long, 1025 long, 1149 long, 1252 long, 1415 long, 1523 long |
| Values for Old Faithful Area | 1975-12-30 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:59 |
| Sunset | 16:52 |
| Civil Twilight End | 17:25 |
| Nautical Twilight End | 18:02 |
| Astronomical Twilight End | 18:37 |
| Moon Illumination | 6.32% |