| Geyser | 1975-05-28 |
|---|---|
| Beehive | 1104 |
| Beehive's Indicator | 1054 ie |
| Castle | 0700 ie |
| Grand | 1216, 1954 ie |
| Riverside | 1012, 1622, 2226 |
| Round | 0749 |
| Spa | 2006, 2010, 2013 |
| Values for Old Faithful Area | 1975-05-28 |
|---|---|
| Astronomical Twilight Begin | 03:27 |
| Nautical Twilight Begin | 04:23 |
| Civil Twilight Begin | 05:08 |
| Sunrise | 05:44 |
| Sunset | 20:56 |
| Civil Twilight End | 21:32 |
| Nautical Twilight End | 22:17 |
| Astronomical Twilight End | 23:13 |
| Moon Illumination | 89.91% |