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The sky on December 1, 1955 — as it really was

That day the Sun stood in Ophiuchus, while the horoscope says "Sagittarius". The gap is 23.2° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–♃ 57.1°☽–♂ 117.7°☽–♀ 177.8°♃–♂ 60.5°♃–♀ 120.6°♂–♀ 60.1° ☽︎3° ♃︎1° ♂︎1° ♄︎25° ☿︎6° ☉︎8° ♀︎1°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 248.5° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 93.9° · sign Cancer · constellation Gemini
  • ☿︎ Mercury — 246.8° · sign Sagittarius · constellation Scorpius
  • ♀︎ Venus — 271.7° · sign Capricorn · constellation Sagittarius
  • ♂︎ Mars — 211.6° · sign Scorpio · constellation Virgo
  • ♃︎ Jupiter — 151.1° · sign Virgo · constellation Leo
  • ♄︎ Saturn — 235.5° · sign Scorpio · constellation Libra
  • ☽︎ Moon 95% 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 gibbous, 95% lit; the Moon was 358,774 km away.

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

    70.8 orbits of the Sun — 66,580 million km, that is 86,602 return trips to the Moon; 25,876 rotations of Earth; with the Sun — 514.2 billion km around the Galactic centre, 19.9 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 346 million km away; today it is 244 million km (closer by 1.4×).

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

    That day fell in solar cycle 19, right at the minimum (16% through the cycle).

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

    Mars returns to that day’s point of its orbit on May 22, 2027; Jupiter — in 2026; a full moon exactly on this date — November 30, 2039

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

    The vernal point has shifted 3,564″ since that day; the real constellations now sit 23.2° away from the astrologers’ “signs”.

    precession 50.29″/yr

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