| Geyser | 1973-04-28 |
|---|---|
| Ebony | 1800 |
| Fan-Norris | 1123 |
| Grand | 1315 |
| Ledge | 0730 A |
| Old Faithful | 0853 long, 1002 short, 1110 long, 1222 short, 1334 long, 1446 long, 1611 short, 1701 long |
| Valentine | 0834 |
| Values for Old Faithful Area | 1973-04-28 |
|---|---|
| Astronomical Twilight Begin | 03:24 |
| Nautical Twilight Begin | 04:07 |
| Civil Twilight Begin | 04:46 |
| Sunrise | 05:17 |
| Sunset | 19:23 |
| Civil Twilight End | 19:55 |
| Nautical Twilight End | 20:34 |
| Astronomical Twilight End | 21:17 |
| Moon Illumination | 25.28% |