| Geyser | 1976-12-27 |
|---|---|
| Oblong | 1130 |
| Old Faithful | 0845 long, 0952 long, 1115 long, 1235 long, 1339 long, 1448, 1601 short |
| Riverside | 1140 |
| Values for Old Faithful Area | 1976-12-27 |
|---|---|
| Astronomical Twilight Begin | 06:13 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:25 |
| Sunrise | 07:58 |
| Sunset | 16:50 |
| Civil Twilight End | 17:23 |
| Nautical Twilight End | 18:00 |
| Astronomical Twilight End | 18:35 |
| Moon Illumination | 39.83% |