| Geyser | 1981-06-30 |
|---|---|
| Africa | 1200 |
| Bear Den | 0845 |
| Echinus | 0855, 1118, 1217, 1435, 1617, 1658 |
| Sunday | 1200 |
| Whirligig | 0802, 0850 |
| Values for Old Faithful Area | 1981-06-30 |
|---|---|
| Astronomical Twilight Begin | 03:15 |
| Nautical Twilight Begin | 04:17 |
| Civil Twilight Begin | 05:05 |
| Sunrise | 05:42 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:38 |
| Moon Illumination | 3.49% |