| Geyser | 1977-08-18 |
|---|---|
| Cistern Spring | 1200 |
| Echinus | 1042, 1545 ie |
| Little Whirligig | 0955 |
| Other Geyser | 1345 |
| Valentine | 1415 |
| Values for Old Faithful Area | 1977-08-18 |
|---|---|
| Astronomical Twilight Begin | 04:38 |
| Nautical Twilight Begin | 05:20 |
| Civil Twilight Begin | 05:58 |
| Sunrise | 06:29 |
| Sunset | 20:24 |
| Civil Twilight End | 20:55 |
| Nautical Twilight End | 21:33 |
| Astronomical Twilight End | 22:15 |
| Moon Illumination | 12.35% |