| Geyser | 1988-09-18 |
|---|---|
| Giantess | 1631 |
| Values for Old Faithful Area | 1988-09-18 |
|---|---|
| Astronomical Twilight Begin | 05:27 |
| Nautical Twilight Begin | 06:03 |
| Civil Twilight Begin | 06:37 |
| Sunrise | 07:06 |
| Sunset | 19:28 |
| Civil Twilight End | 19:57 |
| Nautical Twilight End | 20:31 |
| Astronomical Twilight End | 21:06 |
| Moon Illumination | 40.7% |