The sky on December 13, 1928 — as it really was
That day the Sun stood in Ophiuchus, while the horoscope says "Sagittarius". The gap is 22.9° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 261.3° · sign Sagittarius · constellation Ophiuchus
- ☽︎ Moon — 275.2° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 258.5° · sign Sagittarius · constellation Ophiuchus
- ♀︎ Venus — 301.7° · sign Aquarius · constellation Capricornus
- ♂︎ Mars — 92.6° · sign Cancer · constellation Gemini
- ♃︎ Jupiter — 30.7° · sign Taurus · constellation Aries
- ♄︎ Saturn — 261.5° · sign Sagittarius · constellation Ophiuchus
- ☽︎ Moon 2% 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]
new moon, 2% lit; the Moon was 405,095 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
97.8 orbits of the Sun — 91,919 million km, that is 119,561 return trips to the Moon; 35,725 rotations of Earth; with the Sun — 709.9 billion km around the Galactic centre, 27.4 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 88 million km away; today it is 245 million km (farther by 2.8×).
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 August 20, 2028; Jupiter — in 2035; a full moon exactly on this date — December 13, 2046
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 4,896″ 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.