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The sky on December 8, 1989 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☉ 122.0° ☽︎18° ♃︎8° ♂︎23° ☉︎16° ☿︎1° ♄︎12° ♀︎28°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 256.4° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 18.4° · sign Aries · constellation Pisces
  • ☿︎ Mercury — 271.4° · sign Capricorn · constellation Sagittarius
  • ♀︎ Venus — 298.9° · sign Capricorn · constellation Sagittarius
  • ♂︎ Mars — 233.3° · sign Scorpio · constellation Libra
  • ♃︎ Jupiter — 98.3° · sign Cancer · constellation Gemini
  • ♄︎ Saturn — 282.9° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon 77% 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]

    waxing gibbous, 77% lit; the Moon was 365,559 km away.

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

    36.8 orbits of the Sun — 34,609 million km, that is 45,017 return trips to the Moon; 13,451 rotations of Earth; with the Sun — 267.3 billion km around the Galactic centre, 10.3 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 364 million km away; today it is 244 million km (closer by 1.5×).

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

    That day fell in solar cycle 22, on the rise to maximum (33% through the cycle).

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

    Mars returns to that day’s point of its orbit on July 22, 2027; Jupiter — in 2036; a full moon exactly on this date — December 7, 2041

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

    The vernal point has shifted 1,836″ since that day; the real constellations now sit 23.7° away from the astrologers’ “signs”.

    precession 50.29″/yr

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