| Geyser | 1967-07-21 |
|---|---|
| Bear Den | 1340 |
| Blue | 1000 ie |
| Cistern Spring | 0800 |
| Echinus | 0826, 0916, 1005, 1053, 1142, 1230, 1407, 1458, 1547, 1639 |
| Steamboat | 0800, 1200 |
| Veteran | 1700 |
| Values for Old Faithful Area | 1967-07-21 |
|---|---|
| Astronomical Twilight Begin | 03:45 |
| Nautical Twilight Begin | 04:38 |
| 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 | 99.85% |