| Geyser | 1975-12-19 |
|---|---|
| Depression | 1211 |
| Giantess | 1104 |
| Grand | 1235 |
| Old Faithful | 0949 long, 1101 short, 1215, 1324 short, 1436 long, 1557 long |
| Vault | 1002 |
| Values for Old Faithful Area | 1975-12-19 |
|---|---|
| Astronomical Twilight Begin | 06:09 |
| Nautical Twilight Begin | 06:45 |
| Civil Twilight Begin | 07:21 |
| Sunrise | 07:55 |
| Sunset | 16:45 |
| Civil Twilight End | 17:18 |
| Nautical Twilight End | 17:55 |
| Astronomical Twilight End | 18:31 |
| Moon Illumination | 99.47% |