| Geyser | 1987-04-04 |
|---|---|
| Echinus | 1129, 1217, 1306, 1408, 1500, 1547 |
| Giantess | 1610 ie |
| Harding | 1200 |
| Steamboat | 1200 |
| Values for Old Faithful Area | 1987-04-04 |
|---|---|
| Astronomical Twilight Begin | 04:17 |
| Nautical Twilight Begin | 04:54 |
| Civil Twilight Begin | 05:29 |
| Sunrise | 05:59 |
| Sunset | 18:53 |
| Civil Twilight End | 19:23 |
| Nautical Twilight End | 19:58 |
| Astronomical Twilight End | 20:35 |
| Moon Illumination | 31.15% |