Pivot
The south celestial pole is the fixed pivot. From Tuncurry/NSW, it sits about 32 degrees above the southern horizon.
Southern Cross Calendar
Sidereal time+ Crux angle+ SCP pivot= sky clock
KnownTime + skyFindCrux handPivotSCPHandCruxMotionSiderealUseField reading
CalculationTime
Southern Cross Calendar
A Southern Hemisphere month-marker calendar where Crux turns around the south celestial pole and its midnight position becomes the field reading.
Inputs, result, proof and time.
Use the instrument above, then check the calculation record, assumptions and related tools below.
Method
The month reading comes from sidereal drift around the south celestial pole
The Southern Cross turns around the south celestial pole once per sidereal day. At the same civil clock time on successive nights, the Cross appears about four minutes earlier, so the midnight position advances around the ring through the year and can be read as a seasonal month marker.
Hand
Crux is the hand. The calendar reading uses its rotation around the pole, not a decorative clock overlay.
Boundary
This is an educational field-reading calendar for Southern Hemisphere sky context, not a navigation instrument, official almanac or replacement for local observation conditions.
Source Notes
The source layer is constellation identity, sidereal time and visible field limits
CalculationTime keeps this route tied to the protected Southern Cross Clock and Crux Perpetual pages. The calendar reading depends on Southern Hemisphere visibility, local horizon, latitude, cloud, light pollution and the user correctly identifying Crux and the south celestial pole.