| Geyser | 1974-12-01 |
|---|---|
| Event Non-Geyser Related | 1347, 1350 |
| Grand | 1345 ie |
| Values for Old Faithful Area | 1974-12-01 |
|---|---|
| Astronomical Twilight Begin | 05:55 |
| Nautical Twilight Begin | 06:30 |
| Civil Twilight Begin | 07:06 |
| Sunrise | 07:39 |
| Sunset | 16:45 |
| Civil Twilight End | 17:17 |
| Nautical Twilight End | 17:54 |
| Astronomical Twilight End | 18:29 |
| Moon Illumination | 96.47% |