| Geyser | 1978-06-21 |
|---|---|
| Bear Den | 1055 |
| Echinus | 1350, 1451, 1559 |
| Veteran | 0910 |
| Whirligig | 1045, 1307, 1425 |
| Values for Old Faithful Area | 1978-06-21 |
|---|---|
| Astronomical Twilight Begin | 03:09 |
| Nautical Twilight Begin | 04:13 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:38 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:40 |
| Moon Illumination | 99.76% |