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The sky on December 13, 1960 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–☽ 90.9°♂–♄ 177.6°☽–♄ 91.5° ♂︎15° ☽︎15° ☿︎8° ☉︎21° ♃︎9° ♄︎17° ♀︎3°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 261.5° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 196.0° · sign Libra · constellation Virgo
  • ☿︎ Mercury — 248.7° · sign Sagittarius · constellation Ophiuchus
  • ♀︎ Venus — 303.7° · sign Aquarius · constellation Capricornus
  • ♂︎ Mars — 105.0° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 279.8° · sign Capricorn · constellation Sagittarius
  • ♄︎ Saturn — 287.5° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon 29% 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]

    waning crescent, 29% lit; the Moon was 384,044 km away.

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

    65.8 orbits of the Sun — 61,846 million km, that is 80,444 return trips to the Moon; 24,036 rotations of Earth; with the Sun — 477.7 billion km around the Galactic centre, 18.4 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 93 million km away; today it is 245 million km (farther by 2.6×).

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

    That day fell in solar cycle 19, on the decline (64% through the cycle).

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

    Mars returns to that day’s point of its orbit on October 12, 2026; Jupiter — in 2031; 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 3,312″ since that day; the real constellations now sit 23.3° away from the astrologers’ “signs”.

    precession 50.29″/yr

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