| Geyser | 1999-01-18 |
|---|---|
| Great Fountain | 0528 E, 1728 E |
| Values for Old Faithful Area | 1999-01-18 |
|---|---|
| Astronomical Twilight Begin | 06:11 |
| Nautical Twilight Begin | 06:46 |
| Civil Twilight Begin | 07:22 |
| Sunrise | 07:54 |
| Sunset | 17:13 |
| Civil Twilight End | 17:45 |
| Nautical Twilight End | 18:20 |
| Astronomical Twilight End | 18:55 |
| Moon Illumination | 0.42% |