| Geyser | 1966-08-04 |
|---|---|
| Echinus | 0901, 1013, 1120, 1224, 1326, 1426, 1523, 1621, 1717 |
| Emerald Spring | 1200 |
| Ledge | 1444 |
| Steamboat | 0830-1345 |
| Valentine | 1100 A |
| Values for Old Faithful Area | 1966-08-04 |
|---|---|
| Astronomical Twilight Begin | 04:12 |
| Nautical Twilight Begin | 04:59 |
| Civil Twilight Begin | 05:40 |
| Sunrise | 06:13 |
| Sunset | 20:45 |
| Civil Twilight End | 21:18 |
| Nautical Twilight End | 21:59 |
| Astronomical Twilight End | 22:46 |
| Moon Illumination | 92.55% |