| Geyser | 1978-08-20 |
|---|---|
| Dark Cavern | 1340 |
| Ledge | 1100 |
| Palpitator Spring | 1200 |
| Splutter Pot | 1320 |
| Veteran | 1420 |
| Whirligig | 0740, 1315 |
| Values for Old Faithful Area | 1978-08-20 |
|---|---|
| Astronomical Twilight Begin | 04:41 |
| Nautical Twilight Begin | 05:23 |
| Civil Twilight Begin | 06:00 |
| Sunrise | 06:31 |
| Sunset | 20:21 |
| Civil Twilight End | 20:52 |
| Nautical Twilight End | 21:30 |
| Astronomical Twilight End | 22:11 |
| Moon Illumination | 95.28% |