| Geyser | 1974-06-21 |
|---|---|
| Bear Den | 1038, 1440 |
| Constant | 1107, 1203, 1315, 1510 |
| Echinus | 0910, 1040, 1206, 1522, 1650 |
| Ledge | 1503 |
| Little Whirligig | 0852, 1041, 1117 |
| Whirligig | 0820, 1022 |
| Values for Old Faithful Area | 1974-06-21 |
|---|---|
| Astronomical Twilight Begin | 03:09 |
| Nautical Twilight Begin | 04:13 |
| Civil Twilight Begin | 05:01 |
| Sunrise | 05:38 |
| Sunset | 21:11 |
| Civil Twilight End | 21:48 |
| Nautical Twilight End | 22:36 |
| Astronomical Twilight End | 23:40 |
| Moon Illumination | 1.65% |