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The sky on December 13, 1969 — as it really was

That day the Sun stood in Ophiuchus, while the horoscope says "Sagittarius". The gap is 23.4° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–♂ 119.0° ♄︎2° ♃︎29° ♀︎11° ☉︎21° ☿︎6° ☽︎18° ♂︎28°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 261.3° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 318.1° · sign Aquarius · constellation Capricornus
  • ☿︎ Mercury — 276.0° · sign Capricorn · constellation Sagittarius
  • ♀︎ Venus — 251.2° · sign Sagittarius · constellation Ophiuchus
  • ♂︎ Mars — 328.4° · sign Aquarius · constellation Aquarius
  • ♃︎ Jupiter — 209.5° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 32.5° · sign Taurus · constellation Pisces
  • ☽︎ Moon 23% 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, 23% lit; the Moon was 365,444 km away.

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

    56.8 orbits of the Sun — 53,388 million km, that is 69,443 return trips to the Moon; 20,749 rotations of Earth; with the Sun — 412.3 billion km around the Galactic centre, 15.9 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 217 million km away; today it is 245 million km (farther by 1.1×).

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

    That day fell in solar cycle 20, near maximum (46% through the cycle).

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

    Mars returns to that day’s point of its orbit on April 3, 2028; Jupiter — in 2028; a full moon exactly on this date — December 13, 2046

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

    The vernal point has shifted 2,844″ since that day; the real constellations now sit 23.4° away from the astrologers’ “signs”.

    precession 50.29″/yr

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