| Geyser | 1987-03-29 |
|---|---|
| Rediscovered | 1226, 1247, 1308, 1326, 1350, 1410 |
| Values for Old Faithful Area | 1987-03-29 |
|---|---|
| Astronomical Twilight Begin | 04:30 |
| Nautical Twilight Begin | 05:06 |
| Civil Twilight Begin | 05:40 |
| Sunrise | 06:09 |
| Sunset | 18:46 |
| Civil Twilight End | 19:15 |
| Nautical Twilight End | 19:50 |
| Astronomical Twilight End | 20:26 |
| Moon Illumination | 0.07% |