| Geyser | 1983-09-13 |
|---|---|
| Bear Den | 1300, 1818 min |
| Blue | 1045 |
| Dark Cavern | 1125 |
| Echinus | 1312 |
| Fireball | 1120 |
| Giantess | 1947 |
| Graceful | 1045 |
| Mercury | 1611, 1743, 1849, 1941 |
| Splutter Pot | 1100 |
| Values for Old Faithful Area | 1983-09-13 |
|---|---|
| Astronomical Twilight Begin | 05:19 |
| Nautical Twilight Begin | 05:55 |
| Civil Twilight Begin | 06:30 |
| Sunrise | 06:59 |
| Sunset | 19:38 |
| Civil Twilight End | 20:08 |
| Nautical Twilight End | 20:42 |
| Astronomical Twilight End | 21:18 |
| Moon Illumination | 41.43% |