| Geyser | 1973-01-30 |
|---|---|
| Castle | 1430 |
| Grand | 1610 |
| Old Faithful | 0928 short, 1025 long, 1138 short, 1236 long, 1340 long, 1458 long, 1610 long |
| Riverside | 1515 |
| Values for Old Faithful Area | 1973-01-30 |
|---|---|
| Astronomical Twilight Begin | 06:03 |
| Nautical Twilight Begin | 06:37 |
| Civil Twilight Begin | 07:12 |
| Sunrise | 07:43 |
| Sunset | 17:29 |
| Civil Twilight End | 18:00 |
| Nautical Twilight End | 18:35 |
| Astronomical Twilight End | 19:09 |
| Moon Illumination | 15.5% |