| Geyser | 1974-12-25 |
|---|---|
| Castle | 1411 |
| Grand | 1147 ie |
| Lion | 1526 |
| Lone Star | 1258 |
| Old Faithful | 0856 long, 1011 long, 1117 long, 1227 long, 1332 long, 1446 long, 1552 short, 2050 long, 2206 long |
| Riverside | 1530 ie |
| Values for Old Faithful Area | 1974-12-25 |
|---|---|
| Astronomical Twilight Begin | 06:12 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:24 |
| Sunrise | 07:58 |
| Sunset | 16:48 |
| Civil Twilight End | 17:21 |
| Nautical Twilight End | 17:58 |
| Astronomical Twilight End | 18:34 |
| Moon Illumination | 82.08% |