| Geyser | 1977-07-08 |
|---|---|
| Bear Den | 1235 |
| Echinus | 0950 A, 1036 |
| Ledge | 1200 |
| Mud Spring | 1200 |
| Veteran | 0951, 1240 |
| Yellow Funnel Spring | 1200 |
| Values for Old Faithful Area | 1977-07-08 |
|---|---|
| Astronomical Twilight Begin | 03:24 |
| Nautical Twilight Begin | 04:24 |
| Civil Twilight Begin | 05:11 |
| Sunrise | 05:47 |
| Sunset | 21:09 |
| Civil Twilight End | 21:45 |
| Nautical Twilight End | 22:32 |
| Astronomical Twilight End | 23:31 |
| Moon Illumination | 49.57% |