Sky on January 21, 2010: where the Sun, Moon and planets really were

The real sky on January 21, 2010: Sun in Capricornus (horoscope says "Aquarius"), Moon 31% lit, planet positions from ephemerides.

The sky on January 21, 2010 — as it really was

That day the Sun stood in Capricornus, while the horoscope says "Aquarius". The gap is 24.0° 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]
waxing crescent, 31% lit; the Moon was 398,092 km away.
astronomy-engine
How far Earth has travelled since [EXACT]
16.7 orbits of the Sun — 15,695 million km, that is 20,415 return trips to the Moon; 6,100 rotations of Earth; with the Sun — 121.2 billion km around the Galactic centre, 4.7 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 100 million km away; today it is 246 million km (farther by 2.5×).
astronomy-engine; checked against JPL Horizons for 2026-09-14
Solar cycle [ESTIMATE]
That day fell in solar cycle 24, right at the minimum (10% through the cycle).
SILSO smoothed minima
When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on December 26, 2026; Jupiter — in 2034; a full moon exactly on this date — January 21, 2038
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr
How far the sky has drifted since [EXACT]
The vernal point has shifted 828″ since that day; the real constellations now sit 24° away from the astrologers’ “signs”.
precession 50.29″/yr
Picture of the day [EXACT]
NASA Astronomy Picture of the Day for this date: apod.nasa.gov/apod/ap100121.html
NASA APOD

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