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The sky on October 20, 1986 — as it really was

That day the Sun stood in Virgo, while the horoscope says "Libra". The gap is 23.7° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄–♂ 59.4° ☽︎27° ☉︎26° ♀︎19° ☿︎21° ♄︎7° ♂︎6° ♃︎13°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 206.8° · sign Libra · constellation Virgo
  • ☽︎ Moon — 57.4° · sign Taurus · constellation Taurus
  • ☿︎ Mercury — 231.1° · sign Scorpio · constellation Libra
  • ♀︎ Venus — 229.9° · sign Scorpio · constellation Libra
  • ♂︎ Mars — 306.5° · sign Aquarius · constellation Capricornus
  • ♃︎ Jupiter — 343.6° · sign Pisces · constellation Aquarius
  • ♄︎ Saturn — 247.1° · sign Sagittarius · constellation Scorpius
  • ☽︎ Moon 93% 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.

  1. The Moon that day [EXACT]

    waning gibbous, 93% lit; the Moon was 401,263 km away.

    astronomy-engine
  2. How far Earth has travelled since [EXACT]

    40 orbits of the Sun — 37,554 million km, that is 48,847 return trips to the Moon; 14,595 rotations of Earth; with the Sun — 290 billion km around the Galactic centre, 11.2 light-days.

    29.78 km/s along the orbit; 230 km/s around the Galactic centre
  3. Mars then and now [EXACT]

    On that day Mars was 121 million km away; today it is 244 million km (farther by 2×).

    astronomy-engine; checked against JPL Horizons for 2026-09-14
  4. Solar cycle [ESTIMATE]

    That day fell in solar cycle 22, right at the minimum (1% through the cycle).

    SILSO smoothed minima
  5. When the sky repeats [EXACT]

    Mars returns to that day’s point of its orbit on March 7, 2028; Jupiter — in 2033; a full moon exactly on this date — October 20, 2040

    sidereal periods: Mars 686.98 d, Jupiter 11.862 yr
  6. How far the sky has drifted since [EXACT]

    The vernal point has shifted 2,016″ since that day; the real constellations now sit 23.7° away from the astrologers’ “signs”.

    precession 50.29″/yr

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