| Geyser | 1999-03-01 |
|---|---|
| Great Fountain | 0413 E, 1508 E |
| Values for Old Faithful Area | 1999-03-01 |
|---|---|
| Astronomical Twilight Begin | 05:24 |
| Nautical Twilight Begin | 05:57 |
| Civil Twilight Begin | 06:31 |
| Sunrise | 07:00 |
| Sunset | 18:10 |
| Civil Twilight End | 18:39 |
| Nautical Twilight End | 19:13 |
| Astronomical Twilight End | 19:47 |
| Moon Illumination | 98.94% |