| Geyser | 1966-08-30 |
|---|---|
| Cistern Spring | 1800 |
| Echinus | 0916, 1012, 1108, 1203, 1259, 1456, 1544, 1637 |
| Emerald Spring | 1145-1645 |
| Harding | 0800 |
| Ledge | 1103 |
| Scummy Pool | 1800 |
| Steamboat | 0910 |
| Valentine | 1215 |
| Values for Old Faithful Area | 1966-08-30 |
|---|---|
| Astronomical Twilight Begin | 04:58 |
| Nautical Twilight Begin | 05:37 |
| Civil Twilight Begin | 06:13 |
| Sunrise | 06:43 |
| Sunset | 20:04 |
| Civil Twilight End | 20:34 |
| Nautical Twilight End | 21:10 |
| Astronomical Twilight End | 21:49 |
| Moon Illumination | 99.47% |