The sky on March 13, 1931 — as it really was
That day the Sun stood in Pisces — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 352.0° · sign Pisces · constellation Pisces
- ☽︎ Moon — 288.3° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 349.6° · sign Pisces · constellation Aquarius
- ♀︎ Venus — 308.7° · sign Aquarius · constellation Capricornus
- ♂︎ Mars — 117.6° · sign Cancer · constellation Cancer
- ♃︎ Jupiter — 100.5° · sign Cancer · constellation Gemini
- ♄︎ Saturn — 291.2° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon 28% 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 crescent, 28% lit; the Moon was 398,448 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
95.6 orbits of the Sun — 89,809 million km, that is 116,817 return trips to the Moon; 34,904 rotations of Earth; with the Sun — 693.6 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 131 million km away; today it is 245 million km (farther by 1.9×).
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 February 13, 2027; Jupiter — in 2038; a full moon exactly on this date — March 13, 2055
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.