The sky on December 21, 1945 — as it really was
That day the Sun stood in Sagittarius — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 269.3° · sign Sagittarius · constellation Sagittarius
- ☽︎ Moon — 121.5° · sign Leo · constellation Cancer
- ☿︎ Mercury — 248.2° · sign Sagittarius · constellation Ophiuchus
- ♀︎ Venus — 259.2° · sign Sagittarius · constellation Ophiuchus
- ♂︎ Mars — 121.3° · sign Leo · constellation Cancer
- ♃︎ Jupiter — 203.4° · sign Libra · constellation Virgo
- ♄︎ Saturn — 113.1° · sign Cancer · constellation Gemini
- ☽︎ Moon 92% illuminated
astronomy-engine ephemerides (VSOP87/ELP), IAU 1930 constellation boundaries. Positions accurate to a fraction of a degree.
The day’s dossier, from real data
Checkable facts with a tag and a source; the classical reading is in the chart.
- The Moon that day [EXACT]
waning gibbous, 92% lit; the Moon was 373,045 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
80.8 orbits of the Sun — 75,921 million km, that is 98,753 return trips to the Moon; 29,507 rotations of Earth; with the Sun — 586.4 billion km around the Galactic centre, 22.6 light-days.
29.78 km/s along the orbit; 230 km/s around the Galactic centre - Mars then and now [EXACT]
On that day Mars was 102 million km away; today it is 246 million km (farther by 2.4×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on November 6, 2026; Jupiter — in 2028; a full moon exactly on this date — December 20, 2029
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 4,068″ since that day; the real constellations now sit 23.1° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.