| Geyser | 1973-10-01 |
|---|---|
| Dabble | 1000 |
| Dark Cavern | 1700 |
| Emerald Spring | 1000 |
| Ledge | 1700 |
| Little Whirligig | 1700 |
| Minute | 1130 |
| Rubble | 1107 |
| Values for Old Faithful Area | 1973-10-01 |
|---|---|
| Astronomical Twilight Begin | 05:44 |
| Nautical Twilight Begin | 06:18 |
| Civil Twilight Begin | 06:52 |
| Sunrise | 07:21 |
| Sunset | 19:04 |
| Civil Twilight End | 19:33 |
| Nautical Twilight End | 20:07 |
| Astronomical Twilight End | 20:41 |
| Moon Illumination | 21.5% |