| Geyser | 1974-08-31 |
|---|---|
| Africa | 1200 |
| Bear Den | 0901 |
| Blue | 0945 |
| Echinus | 0831, 0941, 1052, 1202, 1314, 1406, 1426, 1537, 1648 |
| Little Whirligig | 1243 |
| Whirligig | 1240 |
| Values for Old Faithful Area | 1974-08-31 |
|---|---|
| Astronomical Twilight Begin | 05:00 |
| Nautical Twilight Begin | 05:38 |
| Civil Twilight Begin | 06:14 |
| Sunrise | 06:44 |
| Sunset | 20:02 |
| Civil Twilight End | 20:32 |
| Nautical Twilight End | 21:08 |
| Astronomical Twilight End | 21:47 |
| Moon Illumination | 97.78% |