The sky on April 21, 1951 — as it really was
That day the Sun stood in Aries, while the horoscope says "Taurus". The gap is 23.2° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 30.6° · sign Taurus · constellation Aries
- ☽︎ Moon — 205.2° · sign Libra · constellation Virgo
- ☿︎ Mercury — 36.5° · sign Taurus · constellation Aries
- ♀︎ Venus — 67.3° · sign Gemini · constellation Taurus
- ♂︎ Mars — 38.2° · sign Taurus · constellation Aries
- ♃︎ Jupiter — 360.0° · sign Pisces · constellation Pisces
- ♄︎ Saturn — 176.7° · sign Virgo · constellation Virgo
- ☽︎ Moon 100% 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]
full moon, 100% lit; the Moon was 366,932 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
75.5 orbits of the Sun — 70,912 million km, that is 92,237 return trips to the Moon; 27,560 rotations of Earth; with the Sun — 547.7 billion km around the Galactic centre, 21.1 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 367 million km away; today it is 245 million km (closer by 1.5×).
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 June 1, 2028; Jupiter — in 2034; a full moon exactly on this date — April 20, 2027
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 3,780″ since that day; the real constellations now sit 23.2° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.