| Geyser | 1979-07-21 |
|---|---|
| Africa | 1800 |
| Constant | 0950:52, 1036:07 |
| Echinus | 1409 |
| Little Whirligig | 1100 |
| Splutter Pot | 1200 |
| Whirligig | 1033, 1453 |
| Values for Old Faithful Area | 1979-07-21 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:39 |
| Civil Twilight Begin | 05:23 |
| Sunrise | 05:58 |
| Sunset | 21:01 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:20 |
| Astronomical Twilight End | 23:13 |
| Moon Illumination | 7.62% |