| Geyser | 1999-05-22 |
|---|---|
| Great Fountain | 0118 E, 1353 E |
| Values for Old Faithful Area | 1999-05-22 |
|---|---|
| Astronomical Twilight Begin | 03:36 |
| Nautical Twilight Begin | 04:29 |
| Civil Twilight Begin | 05:14 |
| Sunrise | 05:48 |
| Sunset | 20:51 |
| Civil Twilight End | 21:25 |
| Nautical Twilight End | 22:10 |
| Astronomical Twilight End | 23:03 |
| Moon Illumination | 50.19% |