| Geyser | 1999-05-09 |
|---|---|
| Castle | 0432 E, 1017 E |
| Giant | 0727 |
| Great Fountain | 0438 E, 1658 E |
| Values for Old Faithful Area | 1999-05-09 |
|---|---|
| Astronomical Twilight Begin | 04:01 |
| Nautical Twilight Begin | 04:48 |
| Civil Twilight Begin | 05:29 |
| Sunrise | 06:02 |
| Sunset | 20:36 |
| Civil Twilight End | 21:09 |
| Nautical Twilight End | 21:50 |
| Astronomical Twilight End | 22:38 |
| Moon Illumination | 44.56% |