| Geyser | 1971-01-25 |
|---|---|
| Castle | 1003 |
| Grand | 1630 ? |
| Old Faithful | 1057 short, 1138 long, 1252 short, 1351 long, 1503 short |
| Riverside | 0400 ?, 1530 |
| Values for Old Faithful Area | 1971-01-25 |
|---|---|
| Astronomical Twilight Begin | 06:08 |
| Nautical Twilight Begin | 06:42 |
| Civil Twilight Begin | 07:17 |
| Sunrise | 07:49 |
| Sunset | 17:22 |
| Civil Twilight End | 17:53 |
| Nautical Twilight End | 18:28 |
| Astronomical Twilight End | 19:03 |
| Moon Illumination | 3.9% |