| Geyser | 1977-01-30 |
|---|---|
| Beehive | 1451 |
| Grand | 1111 ie |
| Old Faithful | 0915 long, 1026, 1134 long, 1251, 1403 short, 1458 long, 1610, 1728 long, 1836 short, 1924 long, 2037 long |
| Riverside | 1240 |
| Values for Old Faithful Area | 1977-01-30 |
|---|---|
| Astronomical Twilight Begin | 06:03 |
| Nautical Twilight Begin | 06:37 |
| Civil Twilight Begin | 07:12 |
| Sunrise | 07:43 |
| Sunset | 17:29 |
| Civil Twilight End | 18:00 |
| Nautical Twilight End | 18:35 |
| Astronomical Twilight End | 19:09 |
| Moon Illumination | 77.47% |