| Geyser | 1975-10-17 |
|---|---|
| Castle | 0837 ie |
| Grand | 1044, 1947 ie |
| Old Faithful | 0854 short, 0949 long, 1111 short, 1159 long, 1322 long, 1424 long, 1539 long, 1649 long |
| Riverside | 1218 |
| Values for Old Faithful Area | 1975-10-17 |
|---|---|
| Astronomical Twilight Begin | 06:03 |
| Nautical Twilight Begin | 06:37 |
| Civil Twilight Begin | 07:11 |
| Sunrise | 07:40 |
| Sunset | 18:36 |
| Civil Twilight End | 19:06 |
| Nautical Twilight End | 19:39 |
| Astronomical Twilight End | 20:13 |
| Moon Illumination | 92.17% |