| Geyser | 1977-04-17 |
|---|---|
| Beehive's Indicator | 1141, 1458 |
| Depression | 1048 ie, 1625 |
| Grand | 1341 ie |
| Old Faithful | 0651 ie, 0808, 0918 short, 1033 long, 1140 long, 1249 long, 1408 long, 1523 short, 1616 |
| Values for Old Faithful Area | 1977-04-17 |
|---|---|
| Astronomical Twilight Begin | 03:48 |
| Nautical Twilight Begin | 04:27 |
| Civil Twilight Begin | 05:04 |
| Sunrise | 05:35 |
| Sunset | 19:10 |
| Civil Twilight End | 19:40 |
| Nautical Twilight End | 20:17 |
| Astronomical Twilight End | 20:57 |
| Moon Illumination | 1.25% |