The sky on October 21, 1931 — as it really was
That day the Sun stood in Virgo, while the horoscope says "Libra". The gap is 22.9° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 207.1° · sign Libra · constellation Virgo
- ☽︎ Moon — 332.2° · sign Pisces · constellation Aquarius
- ☿︎ Mercury — 209.0° · sign Libra · constellation Virgo
- ♀︎ Venus — 218.5° · sign Scorpio · constellation Libra
- ♂︎ Mars — 233.6° · sign Scorpio · constellation Libra
- ♃︎ Jupiter — 139.0° · sign Leo · constellation Leo
- ♄︎ Saturn — 287.4° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon 79% 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, 79% lit; the Moon was 402,845 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
95 orbits of the Sun — 89,237 million km, that is 116,073 return trips to the Moon; 34,682 rotations of Earth; with the Sun — 689.2 billion km around the Galactic centre, 26.6 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 347 million km away; today it is 246 million km (closer by 1.4×).
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 September 23, 2027; Jupiter — in 2038; a full moon exactly on this date — October 21, 2059
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 4,752″ 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.