| Geyser | 1972-05-17 |
|---|---|
| Beehive | 0940 |
| Fan-Norris | 1200 |
| Grand | 1002 |
| Old Faithful | 0928 long, 1037 long, 1143 long, 1249 long, 1405 long, 1514 long, 1626 long, 1729 long |
| Riverside | 1550 |
| Valentine | 0000 |
| Values for Old Faithful Area | 1972-05-17 |
|---|---|
| Astronomical Twilight Begin | 03:44 |
| Nautical Twilight Begin | 04:35 |
| Civil Twilight Begin | 05:18 |
| Sunrise | 05:53 |
| Sunset | 20:46 |
| Civil Twilight End | 21:20 |
| Nautical Twilight End | 22:03 |
| Astronomical Twilight End | 22:54 |
| Moon Illumination | 21.9% |