| Geyser | 1976-05-20 |
|---|---|
| Castle | 0740 ie, 1654 |
| Grand | 1145 |
| Old Faithful | 0818 short, 0937 long, 1048 long, 1206 long, 1316 short, 1423 long, 1542 long, 1654 long, 1809 long |
| Riverside | 0900 |
| Valentine | 1500 A |
| Values for Old Faithful Area | 1976-05-20 |
|---|---|
| Astronomical Twilight Begin | 03:39 |
| Nautical Twilight Begin | 04:31 |
| Civil Twilight Begin | 05:15 |
| Sunrise | 05:50 |
| Sunset | 20:49 |
| Civil Twilight End | 21:23 |
| Nautical Twilight End | 22:08 |
| Astronomical Twilight End | 23:00 |
| Moon Illumination | 56.5% |