| Geyser | 1971-09-30 |
|---|---|
| Grand | 1139 ie |
| Old Faithful | 0840 long, 0954 long, 1104 short, 1145 long, 1303 short, 1345 long, 1503 short, 1556 long |
| Values for Old Faithful Area | 1971-09-30 |
|---|---|
| Astronomical Twilight Begin | 05:42 |
| Nautical Twilight Begin | 06:16 |
| Civil Twilight Begin | 06:50 |
| Sunrise | 07:19 |
| Sunset | 19:07 |
| Civil Twilight End | 19:36 |
| Nautical Twilight End | 20:09 |
| Astronomical Twilight End | 20:44 |
| Moon Illumination | 75.96% |