| Geyser | 1981-09-09 |
|---|---|
| Arsenic | 1040, 1627 |
| Echinus | 1114, 1242 |
| Graceful | 1045, 1140, 1428, 1516, 1602, 1648, 1732 |
| Veteran | 1114 |
| Whirligig | 1649, 1734 |
| Values for Old Faithful Area | 1981-09-09 |
|---|---|
| Astronomical Twilight Begin | 05:14 |
| Nautical Twilight Begin | 05:51 |
| Civil Twilight Begin | 06:26 |
| Sunrise | 06:55 |
| Sunset | 19:45 |
| Civil Twilight End | 20:14 |
| Nautical Twilight End | 20:49 |
| Astronomical Twilight End | 21:26 |
| Moon Illumination | 74.91% |