| Geyser | 1977-02-23 |
|---|---|
| Beehive | 1218 |
| Old Faithful | 0931 long, 1042 short, 1144 long, 1305 long, 1412 long, 1530 short, 1615 long, 1729 long, 1836 long, 1947 short, 2043 long |
| Values for Old Faithful Area | 1977-02-23 |
|---|---|
| Astronomical Twilight Begin | 05:33 |
| Nautical Twilight Begin | 06:07 |
| Civil Twilight Begin | 06:40 |
| Sunrise | 07:10 |
| Sunset | 18:03 |
| Civil Twilight End | 18:32 |
| Nautical Twilight End | 19:06 |
| Astronomical Twilight End | 19:39 |
| Moon Illumination | 24.59% |