| Geyser | 2000-02-21 |
|---|---|
| Grand | 0638 E, 1629 E |
| Great Fountain | 0336 E, 1400 E, 2326 E |
| Values for Old Faithful Area | 2000-02-21 |
|---|---|
| Astronomical Twilight Begin | 05:37 |
| Nautical Twilight Begin | 06:11 |
| Civil Twilight Begin | 06:44 |
| Sunrise | 07:14 |
| Sunset | 17:59 |
| Civil Twilight End | 18:29 |
| Nautical Twilight End | 19:02 |
| Astronomical Twilight End | 19:36 |
| Moon Illumination | 96.62% |