| Geyser | 1977-07-19 |
|---|---|
| Echinus | 0950, 1057, 1203 |
| Values for Old Faithful Area | 1977-07-19 |
|---|---|
| Astronomical Twilight Begin | 03:43 |
| Nautical Twilight Begin | 04:37 |
| Civil Twilight Begin | 05:21 |
| Sunrise | 05:56 |
| Sunset | 21:02 |
| Civil Twilight End | 21:37 |
| Nautical Twilight End | 22:22 |
| Astronomical Twilight End | 23:16 |
| Moon Illumination | 8.31% |