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The sky on December 9, 1959 — as it really was

That day the Sun stood in Ophiuchus, while the horoscope says "Sagittarius". The gap is 23.3° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–♃ 120.7°☽–☉ 117.7° ☽︎14° ♀︎2° ☿︎26° ♂︎4° ♃︎13° ☉︎16° ♄︎6°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 256.7° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 14.4° · sign Aries · constellation Pisces
  • ☿︎ Mercury — 236.1° · sign Scorpio · constellation Libra
  • ♀︎ Venus — 212.1° · sign Scorpio · constellation Virgo
  • ♂︎ Mars — 244.1° · sign Sagittarius · constellation Scorpius
  • ♃︎ Jupiter — 253.7° · sign Sagittarius · constellation Ophiuchus
  • ♄︎ Saturn — 276.8° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon 73% 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, 73% lit; the Moon was 397,708 km away.

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

    66.8 orbits of the Sun — 62,802 million km, that is 81,689 return trips to the Moon; 24,408 rotations of Earth; with the Sun — 485 billion km around the Galactic centre, 18.7 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 371 million km away; today it is 243 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 19, near maximum (54% through the cycle).

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

    Mars returns to that day’s point of its orbit on August 25, 2027; Jupiter — in 2030; a full moon exactly on this date — December 9, 2049

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

    The vernal point has shifted 3,348″ since that day; the real constellations now sit 23.3° away from the astrologers’ “signs”.

    precession 50.29″/yr

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