| Geyser | 1974-07-27 |
|---|---|
| Bear Den | 0945 A, 0951 |
| Constant | 1129, 1347 |
| Echinus | 0944, 1113, 1715 |
| Ledge | 1314 |
| Valentine | 1141 |
| Whirligig | 0923 |
| Values for Old Faithful Area | 1974-07-27 |
|---|---|
| Astronomical Twilight Begin | 03:57 |
| Nautical Twilight Begin | 04:47 |
| Civil Twilight Begin | 05:30 |
| Sunrise | 06:04 |
| Sunset | 20:54 |
| Civil Twilight End | 21:28 |
| Nautical Twilight End | 22:11 |
| Astronomical Twilight End | 23:02 |
| Moon Illumination | 61.19% |