The sky on August 21, 1978 — as it really was
That day the Sun stood in Leo — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 148.1° · sign Leo · constellation Leo
- ☽︎ Moon — 9.6° · sign Aries · constellation Pisces
- ☿︎ Mercury — 143.4° · sign Leo · constellation Leo
- ♀︎ Venus — 194.0° · sign Libra · constellation Virgo
- ♂︎ Mars — 190.8° · sign Libra · constellation Virgo
- ♃︎ Jupiter — 117.0° · sign Cancer · constellation Gemini
- ♄︎ Saturn — 153.2° · sign Virgo · constellation Leo
- ☽︎ Moon 87% 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, 87% lit; the Moon was 373,593 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
48.1 orbits of the Sun — 45,223 million km, that is 58,822 return trips to the Moon; 17,576 rotations of Earth; with the Sun — 349.3 billion km around the Galactic centre, 13.5 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 325 million km away; today it is 246 million km (closer by 1.3×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 21, on the rise to maximum (24% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on July 16, 2027; Jupiter — in 2037; 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 2,412″ 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.