The sky on June 17, 1984 — as it really was
That day the Sun stood in Taurus, while the horoscope says "Gemini". The gap is 23.6° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 86.5° · sign Gemini · constellation Taurus
- ☽︎ Moon — 312.6° · sign Aquarius · constellation Capricornus
- ☿︎ Mercury — 79.6° · sign Gemini · constellation Taurus
- ♀︎ Venus — 86.9° · sign Gemini · constellation Taurus
- ♂︎ Mars — 221.7° · sign Scorpio · constellation Libra
- ♃︎ Jupiter — 279.6° · sign Capricorn · constellation Sagittarius
- ♄︎ Saturn — 220.2° · sign Scorpio · constellation Libra
- ☽︎ Moon 85% 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]
waning gibbous, 85% lit; the Moon was 397,814 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
42.3 orbits of the Sun — 39,755 million km, that is 51,711 return trips to the Moon; 15,451 rotations of Earth; with the Sun — 307 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 89 million km away; today it is 244 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 21, 2027; Jupiter — in 2031; a full moon exactly on this date — June 17, 2038
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.