| Geyser | 1974-08-20 |
|---|---|
| Bear Den | 1259 |
| Cistern Spring | 1200 |
| Constant | 1620 |
| Echinus | 0842, 0951, 1059, 1211, 1321, 1430, 1651 |
| Pinto | 1404, 1500 |
| Values for Old Faithful Area | 1974-08-20 |
|---|---|
| Astronomical Twilight Begin | 04:41 |
| Nautical Twilight Begin | 05:23 |
| Civil Twilight Begin | 06:00 |
| Sunrise | 06:31 |
| Sunset | 20:21 |
| Civil Twilight End | 20:52 |
| Nautical Twilight End | 21:30 |
| Astronomical Twilight End | 22:11 |
| Moon Illumination | 8.83% |