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

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–☿ 61.7°♂–☽ 119.1°☿–☽ 57.4° ♂︎2° ☉︎12° ☿︎3° ♄︎9° ♃︎12° ♀︎21° ☽︎1°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 162.8° · sign Virgo · constellation Leo
  • ☽︎ Moon — 241.3° · sign Sagittarius · constellation Scorpius
  • ☿︎ Mercury — 183.8° · sign Libra · constellation Virgo
  • ♀︎ Venus — 201.3° · sign Libra · constellation Virgo
  • ♂︎ Mars — 122.2° · sign Leo · constellation Cancer
  • ♃︎ Jupiter — 192.6° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 189.2° · sign Libra · constellation Virgo
  • ☽︎ Moon 40% 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, 40% lit; the Moon was 404,403 km away.

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

    45.1 orbits of the Sun — 42,366 million km, that is 55,106 return trips to the Moon; 16,465 rotations of Earth; with the Sun — 327.2 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 331 million km away; today it is 245 million km (closer by 1.4×).

    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 October 27, 2026; Jupiter — in 2028.

    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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