| Geyser | 1983-05-21 |
|---|---|
| Bear Den | 0951 |
| Giantess | 2346 |
| Graceful | 1008 ie, 1026 |
| UNNG-NBK-8 | 1200 |
| Whirligig | 1004 ie, 1050, 1152 |
| Values for Old Faithful Area | 1983-05-21 |
|---|---|
| Astronomical Twilight Begin | 03:38 |
| Nautical Twilight Begin | 04:31 |
| Civil Twilight Begin | 05:15 |
| Sunrise | 05:49 |
| Sunset | 20:49 |
| Civil Twilight End | 21:24 |
| Nautical Twilight End | 22:08 |
| Astronomical Twilight End | 23:01 |
| Moon Illumination | 68.4% |