The sky on April 21, 1984 — as it really was
That day the Sun stood in Aries, while the horoscope says "Taurus". The gap is 23.6° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 31.6° · sign Taurus · constellation Aries
- ☽︎ Moon — 284.3° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 32.7° · sign Taurus · constellation Aries
- ♀︎ Venus — 16.8° · sign Aries · constellation Pisces
- ♂︎ Mars — 236.8° · sign Scorpio · constellation Libra
- ♃︎ Jupiter — 282.9° · sign Capricorn · constellation Sagittarius
- ♄︎ Saturn — 224.0° · sign Scorpio · constellation Libra
- ☽︎ Moon 65% 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, 65% lit; the Moon was 392,027 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
42.5 orbits of the Sun — 39,897 million km, that is 51,895 return trips to the Moon; 15,506 rotations of Earth; with the Sun — 308.1 billion km around the Galactic centre, 11.9 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 90 million km away; today it is 245 million km (farther by 2.7×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 21, on the decline (78% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on July 26, 2027; Jupiter — in 2031; 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 2,124″ 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.