The sky on August 21, 1984 — as it really was
That day the Sun stood in Leo — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 148.6° · sign Leo · constellation Leo
- ☽︎ Moon — 78.3° · sign Gemini · constellation Taurus
- ☿︎ Mercury — 161.3° · sign Virgo · constellation Sextans
- ♀︎ Venus — 166.8° · sign Virgo · constellation Leo
- ♂︎ Mars — 242.0° · sign Sagittarius · constellation Scorpius
- ♃︎ Jupiter — 273.2° · sign Capricorn · constellation Sagittarius
- ♄︎ Saturn — 220.9° · sign Scorpio · constellation Libra
- ☽︎ Moon 33% 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, 33% lit; the Moon was 385,244 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
42.1 orbits of the Sun — 39,583 million km, that is 51,487 return trips to the Moon; 15,384 rotations of Earth; with the Sun — 305.7 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 141 million km away; today it is 246 million km (farther by 1.7×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 21, on the decline (81% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on November 25, 2027; Jupiter — in 2031; a full moon exactly on this date — August 21, 2032
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.