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The sky on December 4, 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 ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–♄ 179.2°☿–♀ 57.7° ☽︎27° ♂︎17° ☿︎25° ☉︎12° ♃︎7° ♄︎16° ♀︎23°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 252.4° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 87.1° · sign Gemini · constellation Taurus
  • ☿︎ Mercury — 235.3° · sign Scorpio · constellation Libra
  • ♀︎ Venus — 293.0° · sign Capricorn · constellation Sagittarius
  • ♂︎ Mars — 107.3° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 277.8° · sign Capricorn · constellation Sagittarius
  • ♄︎ Saturn — 286.5° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon 98% 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]

    full moon, 98% lit; the Moon was 402,809 km away.

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

    65.8 orbits of the Sun — 61,875 million km, that is 80,483 return trips to the Moon; 24,048 rotations of Earth; with the Sun — 477.9 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 97 million km away; today it is 242 million km (farther by 2.5×).

    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 August 20, 2028; Jupiter — in 2031; a full moon exactly on this date — December 3, 2036

    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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