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The sky on December 21, 2022 — as it really was

That day the Sun stood in Sagittarius — sign and constellation agree here.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–☽ 117.2°♃–☉ 90.5° ♃︎0° ♂︎11° ☽︎2° ☉︎29° ♀︎14° ☿︎19° ♄︎21°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 269.6° · sign Sagittarius · constellation Sagittarius
  • ☽︎ Moon — 242.9° · sign Sagittarius · constellation Scorpius
  • ☿︎ Mercury — 289.7° · sign Capricorn · constellation Sagittarius
  • ♀︎ Venus — 284.2° · sign Capricorn · constellation Sagittarius
  • ♂︎ Mars — 71.5° · sign Gemini · constellation Taurus
  • ♃︎ Jupiter — 0.1° · sign Aries · constellation Pisces
  • ♄︎ Saturn — 321.4° · sign Aquarius · constellation Capricornus
  • ☽︎ Moon 5% 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 crescent, 5% lit; the Moon was 365,634 km away.

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

    3.8 orbits of the Sun — 3,558 million km, that is 4,629 return trips to the Moon; 1,383 rotations of Earth; with the Sun — 27.5 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 88 million km away; today it is 246 million km (farther by 2.8×).

    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 12, 2028; Jupiter — in 2034; a full moon exactly on this date — December 20, 2029

    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/ap221221.html

    NASA APOD

Other dates

2022-12-20 2022-12-22 everyone born December 21
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