| Geyser | 1981-07-26 |
|---|---|
| Arsenic | 0957 |
| Bear Den | 2009 |
| Echinus | 1052, 1612:05, 1713:56, 1819:06, 1921:35, 2000 |
| Morning | 0100, 1815 |
| Sunday | 1900 |
| Veteran | 1618 |
| Whirligig | 1534, 1955 |
| Values for Old Faithful Area | 1981-07-26 |
|---|---|
| Astronomical Twilight Begin | 03:56 |
| Nautical Twilight Begin | 04:46 |
| Civil Twilight Begin | 05:29 |
| Sunrise | 06:03 |
| Sunset | 20:55 |
| Civil Twilight End | 21:29 |
| Nautical Twilight End | 22:12 |
| Astronomical Twilight End | 23:03 |
| Moon Illumination | 29.39% |