| Geyser | 1975-10-16 |
|---|---|
| Castle | 0912 |
| Grand | 0930-1100 |
| Old Faithful | 0842 long, 0945 long, 1105 short, 1148 long, 1310 short, 1402 long, 1517 short, 1600 long |
| Riverside | 0150, 0832 ie |
| Values for Old Faithful Area | 1975-10-16 |
|---|---|
| Astronomical Twilight Begin | 06:02 |
| Nautical Twilight Begin | 06:36 |
| Civil Twilight Begin | 07:10 |
| Sunrise | 07:39 |
| Sunset | 18:38 |
| Civil Twilight End | 19:07 |
| Nautical Twilight End | 19:41 |
| Astronomical Twilight End | 20:15 |
| Moon Illumination | 86.36% |