The sky on October 21, 1977 — as it really was
That day the Sun stood in Virgo, while the horoscope says "Libra". The gap is 23.6° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 208.0° · sign Libra · constellation Virgo
- ☽︎ Moon — 323.1° · sign Aquarius · constellation Capricornus
- ☿︎ Mercury — 209.7° · sign Libra · constellation Virgo
- ♀︎ Venus — 185.5° · sign Libra · constellation Virgo
- ♂︎ Mars — 117.7° · sign Cancer · constellation Cancer
- ♃︎ Jupiter — 96.1° · sign Cancer · constellation Gemini
- ♄︎ Saturn — 148.3° · sign Leo · constellation Leo
- ☽︎ Moon 71% 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]
waxing gibbous, 71% lit; the Moon was 379,697 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
49 orbits of the Sun — 46,005 million km, that is 59,840 return trips to the Moon; 17,880 rotations of Earth; with the Sun — 355.3 billion km around the Galactic centre, 13.7 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 175 million km away; today it is 246 million km (farther by 1.4×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 21, right at the minimum (16% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on August 2, 2028; Jupiter — in 2036; a full moon exactly on this date — October 21, 2059
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 2,448″ 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.