| Geyser | 1978-04-13 |
|---|---|
| Bear Den | 1000 A |
| Echinus | 0500 A |
| Harding | 0000 A |
| Little Whirligig | 1025 |
| Values for Old Faithful Area | 1978-04-13 |
|---|---|
| Astronomical Twilight Begin | 03:57 |
| Nautical Twilight Begin | 04:36 |
| Civil Twilight Begin | 05:12 |
| Sunrise | 05:42 |
| Sunset | 19:05 |
| Civil Twilight End | 19:35 |
| Nautical Twilight End | 20:11 |
| Astronomical Twilight End | 20:50 |
| Moon Illumination | 28.96% |