| Geyser | 1971-10-17 |
|---|---|
| Beehive | 0938 |
| Bulger | 1435 |
| Castle | 1355 |
| Depression | 1316 |
| Grand | 1450 |
| Old Faithful | 0857 short, 0945 long, 1104 short, 1154 long, 1309 short, 1353 long, 1504 short, 1559 long |
| Sawmill | 1430 |
| Spasmodic | 1430 |
| Values for Old Faithful Area | 1971-10-17 |
|---|---|
| Astronomical Twilight Begin | 06:03 |
| Nautical Twilight Begin | 06:37 |
| Civil Twilight Begin | 07:11 |
| Sunrise | 07:40 |
| Sunset | 18:36 |
| Civil Twilight End | 19:06 |
| Nautical Twilight End | 19:39 |
| Astronomical Twilight End | 20:13 |
| Moon Illumination | 3.84% |