| Geyser | 1971-05-17 |
|---|---|
| Beehive | 1820 |
| Bijou | 0845 |
| Castle | 0825 ie |
| Grotto | 0845 |
| Oblong | 0930 |
| Old Faithful | 0826 long, 1027 long, 1148 short, 1240, 1356 short, 1438 long, 1556 short, 1642 long |
| Values for Old Faithful Area | 1971-05-17 |
|---|---|
| Astronomical Twilight Begin | 03:46 |
| Nautical Twilight Begin | 04:36 |
| Civil Twilight Begin | 05:19 |
| Sunrise | 05:53 |
| Sunset | 20:45 |
| Civil Twilight End | 21:19 |
| Nautical Twilight End | 22:02 |
| Astronomical Twilight End | 22:53 |
| Moon Illumination | 56.66% |