| Geyser | 1977-08-13 |
|---|---|
| Cistern Spring | 1200 |
| Constant | 1030, 1050, 1517 |
| Echinus | 0845, 1049, 1150 |
| Great Fountain | 2045 |
| Little Whirligig | 0915 ie, 1045, 1405 |
| Scummy Pool | 1200 |
| Values for Old Faithful Area | 1977-08-13 |
|---|---|
| Astronomical Twilight Begin | 04:29 |
| Nautical Twilight Begin | 05:13 |
| Civil Twilight Begin | 05:52 |
| Sunrise | 06:24 |
| Sunset | 20:32 |
| Civil Twilight End | 21:03 |
| Nautical Twilight End | 21:42 |
| Astronomical Twilight End | 22:26 |
| Moon Illumination | 2.86% |