| Geyser | 1978-04-02 |
|---|---|
| Blue | 1200 |
| Cistern Spring | 1200 |
| Dark Cavern | 1800 |
| Echinus | 0900, 1004, 1120, 1238 |
| Harding | 1200 |
| Steamboat | 1200 |
| Veteran | 1200 |
| Values for Old Faithful Area | 1978-04-02 |
|---|---|
| Astronomical Twilight Begin | 04:21 |
| Nautical Twilight Begin | 04:57 |
| Civil Twilight Begin | 05:32 |
| Sunrise | 06:02 |
| Sunset | 18:51 |
| Civil Twilight End | 19:20 |
| Nautical Twilight End | 19:55 |
| Astronomical Twilight End | 20:32 |
| Moon Illumination | 31.52% |