| Geyser | 1988-07-13 |
|---|---|
| Echinus | 1030, 1145, 1510 |
| Values for Old Faithful Area | 1988-07-13 |
|---|---|
| Astronomical Twilight Begin | 03:33 |
| Nautical Twilight Begin | 04:30 |
| Civil Twilight Begin | 05:16 |
| Sunrise | 05:51 |
| Sunset | 21:06 |
| Civil Twilight End | 21:42 |
| Nautical Twilight End | 22:28 |
| Astronomical Twilight End | 23:24 |
| Moon Illumination | 0.45% |