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The sky on December 17, 1992 — as it really was

That day the Sun stood in Ophiuchus, while the horoscope says "Sagittarius". The gap is 23.8° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☿ 61.6°♃–♀ 118.2°♃–♄ 122.9° ♂︎25° ☽︎4° ♃︎11° ☿︎6° ☉︎25° ♀︎10° ♄︎14°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 265.8° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 185.0° · sign Libra · constellation Virgo
  • ☿︎ Mercury — 246.5° · sign Sagittarius · constellation Scorpius
  • ♀︎ Venus — 310.2° · sign Aquarius · constellation Capricornus
  • ♂︎ Mars — 115.2° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 192.0° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 314.9° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon 42% 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, 42% lit; the Moon was 372,334 km away.

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

    33.8 orbits of the Sun — 31,765 million km, that is 41,318 return trips to the Moon; 12,346 rotations of Earth; with the Sun — 245.3 billion km around the Galactic centre, 9.5 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 98 million km away; today it is 244 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 22, on the decline (63% through the cycle).

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

    Mars returns to that day’s point of its orbit on October 26, 2026; Jupiter — in 2028; a full moon exactly on this date — December 16, 2032

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

    The vernal point has shifted 1,692″ since that day; the real constellations now sit 23.8° away from the astrologers’ “signs”.

    precession 50.29″/yr

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