Slide this to match midnight to the time of year:
                      <evening...midnight...morning>

| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | jan | feb | mar | apr | may |
Sidereal |        |        |        |        |       |        |        |         |        |        |
Time     09       12       15       18       21      24       03       06        09       12       15