| Geyser | 1977-09-29 |
|---|---|
| Constant | 1305, 1555 |
| Echinus | 1230 |
| Little Whirligig | 0810, 1320 |
| Values for Old Faithful Area | 1977-09-29 |
|---|---|
| Astronomical Twilight Begin | 05:41 |
| Nautical Twilight Begin | 06:16 |
| Civil Twilight Begin | 06:50 |
| Sunrise | 07:18 |
| Sunset | 19:08 |
| Civil Twilight End | 19:36 |
| Nautical Twilight End | 20:10 |
| Astronomical Twilight End | 20:45 |
| Moon Illumination | 96.23% |