| Geyser | 1964-10-17 |
|---|---|
| Arsenic | 1800 |
| Colloidal Pool | 1200 |
| Dark Cavern | 1800 |
| Echinus | 0831, 0958, 1125, 1303, 1428, 1601 |
| Fireball | 1800 |
| Ledge | 1800 |
| Pinto | 1800 |
| Steamboat | 1309-1339 |
| Sunday | 1800 |
| Values for Old Faithful Area | 1964-10-17 |
|---|---|
| Astronomical Twilight Begin | 05:04 |
| Nautical Twilight Begin | 05:38 |
| Civil Twilight Begin | 06:12 |
| Sunrise | 06:41 |
| Sunset | 17:35 |
| Civil Twilight End | 18:05 |
| Nautical Twilight End | 18:38 |
| Astronomical Twilight End | 19:12 |
| Moon Illumination | 82.52% |