| Geyser | 1973-02-15 |
|---|---|
| Grand | 1230 |
| Old Faithful | 0906 short, 1000 long, 1107 short, 1200 long, 1316 short, 1414 long, 1523 short, 1614 long |
| Riverside | 1150 |
| Values for Old Faithful Area | 1973-02-15 |
|---|---|
| Astronomical Twilight Begin | 05:45 |
| Nautical Twilight Begin | 06:19 |
| Civil Twilight Begin | 06:53 |
| Sunrise | 07:22 |
| Sunset | 17:52 |
| Civil Twilight End | 18:21 |
| Nautical Twilight End | 18:55 |
| Astronomical Twilight End | 19:29 |
| Moon Illumination | 94.29% |