| Geyser | 1977-05-27 |
|---|---|
| Echinus | 1523 |
| Values for Old Faithful Area | 1977-05-27 |
|---|---|
| Astronomical Twilight Begin | 03:27 |
| Nautical Twilight Begin | 04:23 |
| Civil Twilight Begin | 05:09 |
| Sunrise | 05:44 |
| Sunset | 20:56 |
| Civil Twilight End | 21:31 |
| Nautical Twilight End | 22:17 |
| Astronomical Twilight End | 23:12 |
| Moon Illumination | 61.75% |