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The sky on October 5, 1981 — as it really was

That day the Sun stood in Virgo, while the horoscope says "Libra". The gap is 23.6° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–♃ 58.1°☿–☽ 59.3° ♂︎20° ☉︎12° ♄︎12° ♃︎18° ☿︎3° ♀︎26° ☽︎3°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 192.2° · sign Libra · constellation Virgo
  • ☽︎ Moon — 273.1° · sign Capricorn · constellation Sagittarius
  • ☿︎ Mercury — 213.8° · sign Scorpio · constellation Virgo
  • ♀︎ Venus — 236.0° · sign Scorpio · constellation Libra
  • ♂︎ Mars — 140.7° · sign Leo · constellation Leo
  • ♃︎ Jupiter — 198.9° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 192.8° · sign Libra · constellation Virgo
  • ☽︎ Moon 42% 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]

    first quarter, 42% lit; the Moon was 401,812 km away.

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

    45 orbits of the Sun — 42,288 million km, that is 55,005 return trips to the Moon; 16,435 rotations of Earth; with the Sun — 326.6 billion km around the Galactic centre, 12.6 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 305 million km away; today it is 245 million km (closer by 1.2×).

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

    That day fell in solar cycle 21, near maximum (53% through the cycle).

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

    Mars returns to that day’s point of its orbit on November 26, 2026; Jupiter — in 2028; a full moon exactly on this date — October 5, 2036

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

    The vernal point has shifted 2,232″ since that day; the real constellations now sit 23.6° away from the astrologers’ “signs”.

    precession 50.29″/yr

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