| Geyser | 1967-10-27 |
|---|---|
| Blue Mud Steam Vent | 1200 |
| Harding | 0800 |
| Ledge | 1800 |
| Mud Spring | 1800 |
| Steamboat | 1800 |
| Tantalus | 1800 |
| Valentine | 0800 |
| Values for Old Faithful Area | 1967-10-27 |
|---|---|
| Astronomical Twilight Begin | 06:15 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:23 |
| Sunrise | 07:53 |
| Sunset | 18:20 |
| Civil Twilight End | 18:50 |
| Nautical Twilight End | 19:24 |
| Astronomical Twilight End | 19:58 |
| Moon Illumination | 42.1% |