| Geyser | 1983-07-20 |
|---|---|
| Blue | 1030 |
| Cistern Spring | 1200 |
| Echinus | 1532, 1613, 1656 ie |
| Porkchop | 1657 ie |
| Steamboat | 1200 |
| Whirligig | 1637 |
| Values for Old Faithful Area | 1983-07-20 |
|---|---|
| Astronomical Twilight Begin | 03:44 |
| Nautical Twilight Begin | 04:37 |
| Civil Twilight Begin | 05:22 |
| Sunrise | 05:57 |
| Sunset | 21:01 |
| Civil Twilight End | 21:36 |
| Nautical Twilight End | 22:21 |
| Astronomical Twilight End | 23:15 |
| Moon Illumination | 80.3% |