| Geyser | 1973-02-21 |
|---|---|
| Beehive | 0849 |
| Castle | 1050 |
| Old Faithful | 0906 short, 0955 long, 1108 short, 1207 long, 1313 short, 1407 long, 1522 short, 1624 long |
| Riverside | 1435 |
| Values for Old Faithful Area | 1973-02-21 |
|---|---|
| Astronomical Twilight Begin | 05:36 |
| Nautical Twilight Begin | 06:10 |
| Civil Twilight Begin | 06:44 |
| Sunrise | 07:13 |
| Sunset | 18:00 |
| Civil Twilight End | 18:29 |
| Nautical Twilight End | 19:03 |
| Astronomical Twilight End | 19:37 |
| Moon Illumination | 83.86% |