| Geyser | 1978-04-15 |
|---|---|
| Blue Mud Steam Vent | 1200 |
| Echinus | 0908, 1028 |
| Little Whirligig | 1200 A, 1315 |
| Values for Old Faithful Area | 1978-04-15 |
|---|---|
| Astronomical Twilight Begin | 03:53 |
| Nautical Twilight Begin | 04:32 |
| Civil Twilight Begin | 05:08 |
| Sunrise | 05:39 |
| Sunset | 19:07 |
| Civil Twilight End | 19:37 |
| Nautical Twilight End | 20:14 |
| Astronomical Twilight End | 20:53 |
| Moon Illumination | 47.23% |