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The sky on December 16, 1985 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♀–♃ 58.8°☉–☽ 59.5° ♂︎1° ☿︎3° ♄︎3° ♀︎16° ☉︎24° ♃︎15° ☽︎24°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 264.5° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 324.0° · sign Aquarius · constellation Capricornus
  • ☿︎ Mercury — 243.2° · sign Sagittarius · constellation Scorpius
  • ♀︎ Venus — 256.3° · sign Sagittarius · constellation Ophiuchus
  • ♂︎ Mars — 211.1° · sign Scorpio · constellation Virgo
  • ♃︎ Jupiter — 315.1° · sign Aquarius · constellation Capricornus
  • ♄︎ Saturn — 243.5° · sign Sagittarius · constellation Scorpius
  • ☽︎ Moon 25% 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 crescent, 25% lit; the Moon was 381,179 km away.

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

    40.8 orbits of the Sun — 38,345 million km, that is 49,876 return trips to the Moon; 14,903 rotations of Earth; with the Sun — 296.2 billion km around the Galactic centre, 11.4 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 304 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, on the decline (93% through the cycle).

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

    Mars returns to that day’s point of its orbit on May 4, 2027; Jupiter — in 2032; a full moon exactly on this date — December 16, 2043

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

    The vernal point has shifted 2,052″ since that day; the real constellations now sit 23.7° away from the astrologers’ “signs”.

    precession 50.29″/yr

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