The sky on September 13, 1971 — as it really was
That day the Sun stood in Leo, while the horoscope says "Virgo". The gap is 23.5° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 170.0° · sign Virgo · constellation Leo
- ☽︎ Moon — 101.2° · sign Cancer · constellation Gemini
- ☿︎ Mercury — 152.2° · sign Virgo · constellation Leo
- ♀︎ Venus — 174.6° · sign Virgo · constellation Virgo
- ♂︎ Mars — 312.0° · sign Aquarius · constellation Capricornus
- ♃︎ Jupiter — 240.2° · sign Sagittarius · constellation Libra
- ♄︎ Saturn — 66.5° · sign Gemini · constellation Taurus
- ☽︎ Moon 32% 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]
last quarter, 32% lit; the Moon was 387,586 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
55.1 orbits of the Sun — 51,744 million km, that is 67,304 return trips to the Moon; 20,110 rotations of Earth; with the Sun — 399.6 billion km around the Galactic centre, 15.4 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 66 million km away; today it is 245 million km (farther by 3.7×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 20, on the decline (61% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on February 15, 2028; Jupiter — in 2030; a full moon exactly on this date — September 13, 2057
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 2,772″ since that day; the real constellations now sit 23.5° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.