| Geyser | 1933-07-31 |
|---|---|
| Ebony | 1330 |
| Valentine | 1505 |
| Whirligig | 0725, 0900, 1040, 1238, 1400, 1545, 1720 |
| Values for Old Faithful Area | 1933-07-31 |
|---|---|
| Astronomical Twilight Begin | 03:04 |
| Nautical Twilight Begin | 03:53 |
| Civil Twilight Begin | 04:35 |
| Sunrise | 05:08 |
| Sunset | 19:50 |
| Civil Twilight End | 20:23 |
| Nautical Twilight End | 21:05 |
| Astronomical Twilight End | 21:54 |
| Moon Illumination | 62.38% |