| Geyser | 1981-06-29 |
|---|---|
| Arsenic | 1145 |
| Bear Den | 1340 |
| Echinus | 1210, 1450, 1523, 1612, 1655 |
| Steamvalve Spring | 1520 ie, 2355 ie |
| Whirligig | 1124 |
| Values for Old Faithful Area | 1981-06-29 |
|---|---|
| Astronomical Twilight Begin | 03:14 |
| Nautical Twilight Begin | 04:16 |
| Civil Twilight Begin | 05:04 |
| Sunrise | 05:41 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:39 |
| Moon Illumination | 9.27% |