Sky on January 13, 1980: where the Sun, Moon and planets really were

The real sky on January 13, 1980: Sun in Sagittarius (horoscope says "Capricorn"), Moon 22% lit, planet positions from ephemerides.

The sky on January 13, 1980 — as it really was

That day the Sun stood in Sagittarius, while the horoscope says "Capricorn". 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, 22% lit; the Moon was 388,817 km away.
astronomy-engine
How far Earth has travelled since [EXACT]
46.7 orbits of the Sun — 43,911 million km, that is 57,116 return trips to the Moon; 17,066 rotations of Earth; with the Sun — 339.1 billion km around the Galactic centre, 13.1 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 130 million km away; today it is 245 million km (farther by 1.9×).
astronomy-engine; checked against JPL Horizons for 2026-09-14
Solar cycle [ESTIMATE]
That day fell in solar cycle 21, on the rise to maximum (37% through the cycle).
SILSO smoothed minima
When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on January 21, 2027; Jupiter — in 2027; a full moon exactly on this date — January 13, 2036
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr
How far the sky has drifted since [EXACT]
The vernal point has shifted 2,340″ 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.