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The sky on December 13, 2022 — as it really was

That day the Sun stood in Ophiuchus, while the horoscope says "Sagittarius". The gap is 24.2° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☉ 121.7°☽–♄ 178.9°☉–♄ 59.3° ♂︎14° ☽︎19° ☉︎21° ♀︎4° ☿︎9° ♄︎20° ♃︎29°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 261.4° · sign Sagittarius · constellation Ophiuchus
  • ☽︎ Moon — 139.7° · sign Leo · constellation Leo
  • ☿︎ Mercury — 279.6° · sign Capricorn · constellation Sagittarius
  • ♀︎ Venus — 274.2° · sign Capricorn · constellation Sagittarius
  • ♂︎ Mars — 74.1° · sign Gemini · constellation Taurus
  • ♃︎ Jupiter — 359.5° · sign Pisces · constellation Pisces
  • ♄︎ Saturn — 320.7° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon 76% 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, 76% lit; the Moon was 404,730 km away.

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

    3.8 orbits of the Sun — 3,580 million km, that is 4,657 return trips to the Moon; 1,391 rotations of Earth; with the Sun — 27.6 billion km around the Galactic centre, 1.1 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 84 million km away; today it is 245 million km (farther by 2.9×).

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

    That day fell in solar cycle 25, on the rise to maximum (29% 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, 2028; Jupiter — in 2034; 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 180″ since that day; the real constellations now sit 24.2° away from the astrologers’ “signs”.

    precession 50.29″/yr
  7. Picture of the day [EXACT]

    NASA Astronomy Picture of the Day for this date: apod.nasa.gov/apod/ap221213.html

    NASA APOD

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