| Geyser | 1977-07-30 |
|---|---|
| Echinus | 1637 |
| Ledge | 0300 A |
| Little Whirligig | 0830 |
| Valentine | 0300 A |
| Values for Old Faithful Area | 1977-07-30 |
|---|---|
| Astronomical Twilight Begin | 04:03 |
| Nautical Twilight Begin | 04:52 |
| Civil Twilight Begin | 05:34 |
| Sunrise | 06:08 |
| Sunset | 20:51 |
| Civil Twilight End | 21:24 |
| Nautical Twilight End | 22:06 |
| Astronomical Twilight End | 22:55 |
| Moon Illumination | 99.94% |