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The sky on September 29, 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 ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–♃ 60.5°♂–♀ 92.1° ♂︎17° ☉︎6° ♄︎12° ♃︎17° ☽︎21° ☿︎1° ♀︎19°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 186.3° · sign Libra · constellation Virgo
  • ☽︎ Moon — 201.4° · sign Libra · constellation Virgo
  • ☿︎ Mercury — 211.5° · sign Scorpio · constellation Virgo
  • ♀︎ Venus — 229.2° · sign Scorpio · constellation Libra
  • ♂︎ Mars — 137.1° · sign Leo · constellation Cancer
  • ♃︎ Jupiter — 197.6° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 192.0° · sign Libra · constellation Virgo
  • ☽︎ Moon 2% 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]

    new moon, 2% lit; the Moon was 399,668 km away.

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

    45 orbits of the Sun — 42,304 million km, that is 55,025 return trips to the Moon; 16,441 rotations of Earth; with the Sun — 326.7 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 311 million km away; today it is 245 million km (closer by 1.3×).

    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 20, 2026; Jupiter — in 2028; a full moon exactly on this date — September 29, 2042

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

    The vernal point has shifted 2,268″ since that day; the real constellations now sit 23.6° away from the astrologers’ “signs”.

    precession 50.29″/yr

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