Sky on January 31, 1981: where the Sun, Moon and planets really were

The real sky on January 31, 1981: Sun in Capricornus (horoscope says "Aquarius"), Moon 20% lit, planet positions from ephemerides.

The sky on January 31, 1981 — as it really was

That day the Sun stood in Capricornus, while the horoscope says "Aquarius". The gap is 23.6° of precession.

astronomy-engine ephemerides (VSOP87/ELP), IAU 1930 constellation boundaries. Positions accurate to a fraction of a degree.

Checkable facts with a tag and a source; the classical reading is in the chart.

The Moon that day [EXACT]
waning crescent, 20% lit; the Moon was 396,174 km away.
astronomy-engine
How far Earth has travelled since [EXACT]
45.7 orbits of the Sun — 42,923 million km, that is 55,831 return trips to the Moon; 16,682 rotations of Earth; with the Sun — 331.5 billion km around the Galactic centre, 12.8 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 347 million km away; today it is 245 million km (closer by 1.4×).
astronomy-engine; checked against JPL Horizons for 2026-09-14
Solar cycle [ESTIMATE]
That day fell in solar cycle 21, near maximum (47% through the cycle).
SILSO smoothed minima
When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on February 9, 2028; Jupiter — in 2028; a full moon exactly on this date — January 31, 2048
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr
How far the sky has drifted since [EXACT]
The vernal point has shifted 2,304″ since that day; the real constellations now sit 23.6° away from the astrologers’ “signs”.
precession 50.29″/yr

Computed from the date only; nothing about you is stored.