| Geyser | 1968-07-21 |
|---|---|
| Ebony | 0000 A, 0900 A, 2100 A |
| Echinus | 0845, 0919, 1027, 1135, 1505, 1610, 1735 |
| Emerald Spring | 1800 |
| Fan-Norris | 1705 |
| Ledge | 2100 |
| Monarch | 1800 |
| Values for Old Faithful Area | 1968-07-21 |
|---|---|
| Astronomical Twilight Begin | 03:47 |
| Nautical Twilight Begin | 04:39 |
| Civil Twilight Begin | 05:24 |
| Sunrise | 05:58 |
| Sunset | 21:00 |
| Civil Twilight End | 21:35 |
| Nautical Twilight End | 22:19 |
| Astronomical Twilight End | 23:12 |
| Moon Illumination | 16.44% |