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The sky on December 5, 1974 — as it really was

That day the Sun stood in Ophiuchus, while the horoscope says "Sagittarius". The gap is 23.5° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄︎17° ☽︎0° ♂︎26° ☿︎5° ☉︎12° ♀︎20° ♃︎9°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 253.0° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 150.8° · sign Virgo · constellation Sextans
  • ☿︎ Mercury — 245.1° · sign Sagittarius · constellation Scorpius
  • ♀︎ Venus — 260.1° · sign Sagittarius · constellation Ophiuchus
  • ♂︎ Mars — 236.2° · sign Scorpio · constellation Libra
  • ♃︎ Jupiter — 339.7° · sign Pisces · constellation Aquarius
  • ♄︎ Saturn — 107.8° · sign Cancer · constellation Gemini
  • ☽︎ Moon 61% 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]

    last quarter, 61% lit; the Moon was 369,434 km away.

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

    51.8 orbits of the Sun — 48,716 million km, that is 63,366 return trips to the Moon; 18,933 rotations of Earth; with the Sun — 376.2 billion km around the Galactic centre, 14.5 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 20, on the decline (89% through the cycle).

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

    Mars returns to that day’s point of its orbit on August 4, 2027; Jupiter — in 2033; a full moon exactly on this date — December 4, 2044

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

    The vernal point has shifted 2,592″ since that day; the real constellations now sit 23.5° away from the astrologers’ “signs”.

    precession 50.29″/yr

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