| Geyser | 1973-01-13 |
|---|---|
| Old Faithful | 0930 short, 1019 long, 1140 short, 1232 long, 1343 short, 1427 long, 1543 short, 1630 long |
| Values for Old Faithful Area | 1973-01-13 |
|---|---|
| Astronomical Twilight Begin | 06:13 |
| Nautical Twilight Begin | 06:48 |
| Civil Twilight Begin | 07:24 |
| Sunrise | 07:57 |
| Sunset | 17:07 |
| Civil Twilight End | 17:39 |
| Nautical Twilight End | 18:15 |
| Astronomical Twilight End | 18:50 |
| Moon Illumination | 62% |