| Geyser | 1971-01-30 |
|---|---|
| Old Faithful | 1036 long, 1147 short, 1246 long |
| Values for Old Faithful Area | 1971-01-30 |
|---|---|
| Astronomical Twilight Begin | 06:04 |
| Nautical Twilight Begin | 06:38 |
| Civil Twilight Begin | 07:13 |
| Sunrise | 07:44 |
| Sunset | 17:29 |
| Civil Twilight End | 18:00 |
| Nautical Twilight End | 18:35 |
| Astronomical Twilight End | 19:09 |
| Moon Illumination | 15.45% |