| Geyser | 1977-10-02 |
|---|---|
| Blue Mud Steam Vent | 1200 |
| Emerald Spring | 1200 |
| Yellow Funnel Spring | 1200 |
| Values for Old Faithful Area | 1977-10-02 |
|---|---|
| Astronomical Twilight Begin | 05:45 |
| Nautical Twilight Begin | 06:19 |
| Civil Twilight Begin | 06:53 |
| Sunrise | 07:22 |
| Sunset | 19:02 |
| Civil Twilight End | 19:31 |
| Nautical Twilight End | 20:05 |
| Astronomical Twilight End | 20:39 |
| Moon Illumination | 78% |