| Geyser | 1973-02-20 |
|---|---|
| Castle | 1440 |
| Grand | 1200 |
| Old Faithful | 0926 short, 1037 short, 1136 long, 1246 short, 1338 long, 1452 short, 1543 long, 1654 short |
| Riverside | 1045 |
| Values for Old Faithful Area | 1973-02-20 |
|---|---|
| Astronomical Twilight Begin | 05:38 |
| Nautical Twilight Begin | 06:11 |
| Civil Twilight Begin | 06:45 |
| Sunrise | 07:15 |
| Sunset | 17:59 |
| Civil Twilight End | 18:28 |
| Nautical Twilight End | 19:02 |
| Astronomical Twilight End | 19:36 |
| Moon Illumination | 90.61% |