| Geyser | 1973-04-02 |
|---|---|
| Emerald Spring | 1800 |
| Ledge | 1455 A |
| Valentine | 1310 |
| Values for Old Faithful Area | 1973-04-02 |
|---|---|
| Astronomical Twilight Begin | 04:20 |
| Nautical Twilight Begin | 04:57 |
| Civil Twilight Begin | 05:32 |
| Sunrise | 06:01 |
| Sunset | 18:51 |
| Civil Twilight End | 19:21 |
| Nautical Twilight End | 19:56 |
| Astronomical Twilight End | 20:32 |
| Moon Illumination | 1.9% |