| Geyser | 1980-09-16 |
|---|---|
| Arsenic | 1104 ie |
| Bear Den | 1013, 1503 |
| Blue Mud Steam Vent | 1200 |
| Echinus | 0922 min, 0930 min, 0935:31, 1201:01 min |
| Porkchop | 1815 ie |
| Values for Old Faithful Area | 1980-09-16 |
|---|---|
| Astronomical Twilight Begin | 05:24 |
| Nautical Twilight Begin | 06:00 |
| Civil Twilight Begin | 06:34 |
| Sunrise | 07:03 |
| Sunset | 19:31 |
| Civil Twilight End | 20:01 |
| Nautical Twilight End | 20:35 |
| Astronomical Twilight End | 21:11 |
| Moon Illumination | 37% |