The sky on January 21, 1930 — as it really was
That day the Sun stood in Capricornus, while the horoscope says "Aquarius". The gap is 22.9° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 300.7° · sign Aquarius · constellation Capricornus
- ☽︎ Moon — 208.7° · sign Libra · constellation Virgo
- ☿︎ Mercury — 302.0° · sign Aquarius · constellation Capricornus
- ♀︎ Venus — 296.8° · sign Capricorn · constellation Sagittarius
- ♂︎ Mars — 287.5° · sign Capricorn · constellation Sagittarius
- ♃︎ Jupiter — 66.5° · sign Gemini · constellation Taurus
- ♄︎ Saturn — 276.1° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon 52% 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, 52% lit; the Moon was 385,582 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
96.7 orbits of the Sun — 90,878 million km, that is 118,208 return trips to the Moon; 35,320 rotations of Earth; with the Sun — 701.9 billion km around the Galactic centre, 27.1 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 355 million km away; today it is 246 million km (closer by 1.4×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on November 11, 2027; Jupiter — in 2037; 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 4,860″ since that day; the real constellations now sit 22.9° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.