| Geyser | 1976-12-28 |
|---|---|
| Castle | 0845 ie |
| Grand | 1330 |
| Lion | 1500 |
| Oblong | 1316 ? |
| Old Faithful | 0855, 1006 ie, 1122 long, 1237 long, 1343 long, 1505 long, 1623 short |
| Riverside | 1215 |
| Values for Old Faithful Area | 1976-12-28 |
|---|---|
| Astronomical Twilight Begin | 06:13 |
| Nautical Twilight Begin | 06:49 |
| Civil Twilight Begin | 07:25 |
| Sunrise | 07:59 |
| Sunset | 16:51 |
| Civil Twilight End | 17:24 |
| Nautical Twilight End | 18:01 |
| Astronomical Twilight End | 18:36 |
| Moon Illumination | 49.52% |