| Geyser | 2000-01-28 |
|---|---|
| Giant | 0000 |
| Grand | 0332 E, 1447 E |
| Great Fountain | 0821 E, 1750 E |
| Values for Old Faithful Area | 2000-01-28 |
|---|---|
| Astronomical Twilight Begin | 06:05 |
| Nautical Twilight Begin | 06:39 |
| Civil Twilight Begin | 07:15 |
| Sunrise | 07:46 |
| Sunset | 17:26 |
| Civil Twilight End | 17:57 |
| Nautical Twilight End | 18:32 |
| Astronomical Twilight End | 19:06 |
| Moon Illumination | 50.55% |