| Geyser | 1973-01-23 |
|---|---|
| Beehive | 1240 |
| Old Faithful | 0906 short, 0952 long, 1109 short, 1158 long, 1308 short, 1356 long, 1510 short, 1605 long |
| Riverside | 1520 |
| Values for Old Faithful Area | 1973-01-23 |
|---|---|
| Astronomical Twilight Begin | 06:09 |
| Nautical Twilight Begin | 06:43 |
| Civil Twilight Begin | 07:18 |
| Sunrise | 07:50 |
| Sunset | 17:20 |
| Civil Twilight End | 17:51 |
| Nautical Twilight End | 18:27 |
| Astronomical Twilight End | 19:01 |
| Moon Illumination | 77.79% |