| Geyser | 1977-01-02 |
|---|---|
| Grand | 1140 |
| Old Faithful | 1056, 1215, 1319, 1436, 1546 long, 1651 |
| Values for Old Faithful Area | 1977-01-02 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:50 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:59 |
| Sunset | 16:55 |
| Civil Twilight End | 17:28 |
| Nautical Twilight End | 18:05 |
| Astronomical Twilight End | 18:40 |
| Moon Illumination | 90.35% |