| Geyser | 1974-12-27 |
|---|---|
| Beehive | 0831 |
| Castle | 1049 |
| Grand | 1705 |
| Old Faithful | 0831 long, 0939 short, 1040 long, 1157 long, 1302 short, 1355 long, 1509 short, 1604 long, 2145 |
| Riverside | 1340 |
| Values for Old Faithful Area | 1974-12-27 |
|---|---|
| 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 | 95.33% |