| Geyser | 1999-12-05 |
|---|---|
| Giantess | 0951 ie |
| Grand | 1002 E, 2053 E |
| Great Fountain | 0128 E, 1237 E, 2301 E |
| Values for Old Faithful Area | 1999-12-05 |
|---|---|
| Astronomical Twilight Begin | 05:59 |
| Nautical Twilight Begin | 06:34 |
| Civil Twilight Begin | 07:10 |
| Sunrise | 07:43 |
| Sunset | 16:44 |
| Civil Twilight End | 17:16 |
| Nautical Twilight End | 17:53 |
| Astronomical Twilight End | 18:28 |
| Moon Illumination | 6.27% |