The sky on January 13, 1981 — as it really was
That day the Sun stood in Sagittarius, while the horoscope says "Capricorn". The gap is 23.6° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 293.2° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon — 24.2° · sign Aries · constellation Pisces
- ☿︎ Mercury — 301.4° · sign Aquarius · constellation Capricornus
- ♀︎ Venus — 272.8° · sign Capricorn · constellation Sagittarius
- ♂︎ Mars — 310.7° · sign Aquarius · constellation Capricornus
- ♃︎ Jupiter — 190.2° · sign Libra · constellation Virgo
- ♄︎ Saturn — 189.8° · sign Libra · constellation Virgo
- ☽︎ Moon 51% 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]
first quarter, 51% lit; the Moon was 370,363 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
45.7 orbits of the Sun — 42,969 million km, that is 55,891 return trips to the Moon; 16,700 rotations of Earth; with the Sun — 331.9 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 343 million km away; today it is 246 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 (46% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on January 22, 2028; Jupiter — in 2028; 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 2,304″ since that day; the real constellations now sit 23.6° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.