| Geyser | 1974-07-21 |
|---|---|
| Bear Den | 1611 |
| Echinus | 0904, 1158, 1325, 1453, 1623 |
| Ledge | 1000 |
| Valentine | 1608 |
| Veteran | 1608 |
| Values for Old Faithful Area | 1974-07-21 |
|---|---|
| Astronomical Twilight Begin | 03:46 |
| Nautical Twilight Begin | 04:39 |
| Civil Twilight Begin | 05:23 |
| Sunrise | 05:58 |
| Sunset | 21:00 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:19 |
| Astronomical Twilight End | 23:13 |
| Moon Illumination | 4.72% |