The sky on January 1, 1931 — as it really was
That day the Sun stood in Sagittarius, while the horoscope says "Capricorn". The gap is 22.9° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 280.1° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon — 60.2° · sign Gemini · constellation Taurus
- ☿︎ Mercury — 290.3° · sign Capricorn · constellation Sagittarius
- ♀︎ Venus — 238.5° · sign Scorpio · constellation Libra
- ♂︎ Mars — 135.5° · sign Leo · constellation Cancer
- ♃︎ Jupiter — 106.2° · sign Cancer · constellation Gemini
- ♄︎ Saturn — 283.8° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon 88% 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]
waxing gibbous, 88% lit; the Moon was 380,307 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
95.8 orbits of the Sun — 89,993 million km, that is 117,057 return trips to the Moon; 34,976 rotations of Earth; with the Sun — 695 billion km around the Galactic centre, 26.8 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 108 million km away; today it is 244 million km (farther by 2.3×).
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 December 4, 2026; Jupiter — in 2038; a full moon exactly on this date — December 31, 2028
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 4,788″ since that day; the real constellations now sit 22.9° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.