| Geyser | 1977-07-15 |
|---|---|
| Blue Mud Steam Vent | 1200 |
| Echinus | 1027 |
| Valentine | 0840 ? A |
| Values for Old Faithful Area | 1977-07-15 |
|---|---|
| Astronomical Twilight Begin | 03:36 |
| Nautical Twilight Begin | 04:31 |
| Civil Twilight Begin | 05:17 |
| Sunrise | 05:52 |
| Sunset | 21:05 |
| Civil Twilight End | 21:40 |
| Nautical Twilight End | 22:26 |
| Astronomical Twilight End | 23:22 |
| Moon Illumination | 1.19% |