| Geyser | 1977-04-06 |
|---|---|
| Beehive | 1642 |
| Values for Old Faithful Area | 1977-04-06 |
|---|---|
| Astronomical Twilight Begin | 04:12 |
| Nautical Twilight Begin | 04:49 |
| Civil Twilight Begin | 05:25 |
| Sunrise | 05:54 |
| Sunset | 18:56 |
| Civil Twilight End | 19:26 |
| Nautical Twilight End | 20:01 |
| Astronomical Twilight End | 20:39 |
| Moon Illumination | 93.55% |