The sky on June 21, 1984 — as it really was
That day the Sun stood in Gemini, while the horoscope says "Cancer". The gap is 23.6° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 90.3° · sign Cancer · constellation Gemini
- ☽︎ Moon — 0.7° · sign Aries · constellation Pisces
- ☿︎ Mercury — 88.3° · sign Gemini · constellation Taurus
- ♀︎ Venus — 91.8° · sign Cancer · constellation Gemini
- ♂︎ Mars — 221.7° · sign Scorpio · constellation Libra
- ♃︎ Jupiter — 279.1° · sign Capricorn · constellation Sagittarius
- ♄︎ Saturn — 220.1° · sign Scorpio · constellation Libra
- ☽︎ Moon 50% 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, 50% lit; the Moon was 403,925 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
42.3 orbits of the Sun — 39,740 million km, that is 51,691 return trips to the Moon; 15,445 rotations of Earth; with the Sun — 306.9 billion km around the Galactic centre, 11.8 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 92 million km away; today it is 246 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 (79% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on September 25, 2027; Jupiter — in 2031; a full moon exactly on this date — June 20, 2035
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.