| Geyser | 1964-10-23 |
|---|---|
| Constant | 1800 |
| Dark Cavern | 1800 |
| Echinus | 0954, 1129, 1302, 1436, 1610 |
| Emerald Spring | 1800 |
| Pinto | 1800 |
| Pinwheel | 1800 |
| Steamboat | 0840-1513 |
| Sunday | 1800 |
| Values for Old Faithful Area | 1964-10-23 |
|---|---|
| Astronomical Twilight Begin | 05:12 |
| Nautical Twilight Begin | 05:45 |
| Civil Twilight Begin | 06:19 |
| Sunrise | 06:49 |
| Sunset | 17:26 |
| Civil Twilight End | 17:55 |
| Nautical Twilight End | 18:29 |
| Astronomical Twilight End | 19:03 |
| Moon Illumination | 94.12% |