| Geyser | 1974-12-20 |
|---|---|
| Castle | 1530 |
| Old Faithful | 0723 long, 0829 long, 0953 long, 1111 long, 1224 short, 1305 long, 1427 short, 1511 long, 1638 short, 1728 long, 1841 short, 1947 long, 2108 long |
| Values for Old Faithful Area | 1974-12-20 |
|---|---|
| Astronomical Twilight Begin | 06:10 |
| Nautical Twilight Begin | 06:45 |
| Civil Twilight Begin | 07:22 |
| Sunrise | 07:55 |
| Sunset | 16:45 |
| Civil Twilight End | 17:19 |
| Nautical Twilight End | 17:56 |
| Astronomical Twilight End | 18:31 |
| Moon Illumination | 35.72% |