| Geyser | 1999-01-04 |
|---|---|
| Great Fountain | 0653 E, 1653 E |
| Values for Old Faithful Area | 1999-01-04 |
|---|---|
| Astronomical Twilight Begin | 06:14 |
| Nautical Twilight Begin | 06:50 |
| Civil Twilight Begin | 07:26 |
| Sunrise | 07:59 |
| Sunset | 16:56 |
| Civil Twilight End | 17:29 |
| Nautical Twilight End | 18:06 |
| Astronomical Twilight End | 18:41 |
| Moon Illumination | 94.04% |