| Geyser | 1973-05-01 |
|---|---|
| Bear Den | 1735, 1857, 2018 |
| Ledge | 1151 |
| Old Faithful | 0914 long, 1015, 1128 short, 1221 long, 1333 short, 1421 long, 1536 short, 1632 long, 1747 short |
| Valentine | 0750 A |
| Values for Old Faithful Area | 1973-05-01 |
|---|---|
| Astronomical Twilight Begin | 04:17 |
| Nautical Twilight Begin | 05:01 |
| Civil Twilight Begin | 05:41 |
| Sunrise | 06:13 |
| Sunset | 20:27 |
| Civil Twilight End | 20:59 |
| Nautical Twilight End | 21:38 |
| Astronomical Twilight End | 22:23 |
| Moon Illumination | 3.8% |