| Geyser | 1988-07-20 |
|---|---|
| Echinus | 1041, 1150, 1249, 1355, 1725 |
| Fan and Mortar | 0000 A |
| Values for Old Faithful Area | 1988-07-20 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:38 |
| Civil Twilight Begin | 05:23 |
| Sunrise | 05:58 |
| Sunset | 21:01 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:20 |
| Astronomical Twilight End | 23:13 |
| Moon Illumination | 32.65% |