| Geyser | 1973-03-31 |
|---|---|
| Bear Den | 0853, 1005, 1719, 1832 |
| Constant | 1800 |
| Guardian | 1800 |
| Ledge | 1800, 1830 |
| Valentine | 0946, 1800 |
| Values for Old Faithful Area | 1973-03-31 |
|---|---|
| Astronomical Twilight Begin | 04:25 |
| Nautical Twilight Begin | 05:01 |
| Civil Twilight Begin | 05:36 |
| Sunrise | 06:05 |
| Sunset | 18:49 |
| Civil Twilight End | 19:18 |
| Nautical Twilight End | 19:53 |
| Astronomical Twilight End | 20:29 |
| Moon Illumination | 12.24% |