| Geyser | 1977-09-15 |
|---|---|
| Cats Eye Spring | 1200 |
| Sunday | 1200 |
| Values for Old Faithful Area | 1977-09-15 |
|---|---|
| Astronomical Twilight Begin | 05:23 |
| Nautical Twilight Begin | 05:58 |
| Civil Twilight Begin | 06:33 |
| Sunrise | 07:02 |
| Sunset | 19:34 |
| Civil Twilight End | 20:03 |
| Nautical Twilight End | 20:38 |
| Astronomical Twilight End | 21:13 |
| Moon Illumination | 4.27% |