| Geyser | 1977-01-31 |
|---|---|
| Castle | 1930 ie |
| Grand | 2114 ie |
| Old Faithful | 0806, 1009, 1126 long, 1238 long, 1359 long, 1518 long, 1639 short, 1740 long, 1854 long, 2004 long, 2119 long |
| Riverside | 1311 |
| Values for Old Faithful Area | 1977-01-31 |
|---|---|
| Astronomical Twilight Begin | 06:02 |
| Nautical Twilight Begin | 06:36 |
| Civil Twilight Begin | 07:11 |
| Sunrise | 07:42 |
| Sunset | 17:31 |
| Civil Twilight End | 18:02 |
| Nautical Twilight End | 18:36 |
| Astronomical Twilight End | 19:11 |
| Moon Illumination | 84.99% |