| Geyser | 1975-10-01 |
|---|---|
| Castle | 1152 ie |
| Depression | 1407 |
| Fountain | 1259 ie |
| Grand | 1220, 1936 ie |
| Great Fountain | 2002 |
| Old Faithful | 0803 long, 0916 short, 1018 long, 1127, 1232 long, 1350, 1453 long, 1559 long |
| Riverside | 0757 |
| Values for Old Faithful Area | 1975-10-01 |
|---|---|
| Astronomical Twilight Begin | 05:43 |
| Nautical Twilight Begin | 06:18 |
| Civil Twilight Begin | 06:51 |
| Sunrise | 07:20 |
| Sunset | 19:05 |
| Civil Twilight End | 19:34 |
| Nautical Twilight End | 20:07 |
| Astronomical Twilight End | 20:42 |
| Moon Illumination | 21.05% |