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The sky on December 21, 2024 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–☽ 90.0°♃–♀ 118.2°♃–♄ 90.6°☽–♄ 179.3° ♃︎14° ♂︎4° ☽︎14° ☿︎8° ☉︎0° ♀︎16° ♄︎13°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 270.1° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon — 164.5° · sign Virgo · constellation Leo
  • ☿︎ Mercury — 248.7° · sign Sagittarius · constellation Scorpius
  • ♀︎ Venus — 316.2° · sign Aquarius · constellation Capricornus
  • ♂︎ Mars — 124.7° · sign Leo · constellation Cancer
  • ♃︎ Jupiter — 74.4° · sign Gemini · constellation Taurus
  • ♄︎ Saturn — 343.8° · sign Pisces · constellation Aquarius
  • ☽︎ Moon 64% 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, 64% lit; the Moon was 399,403 km away.

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

    1.8 orbits of the Sun — 1,678 million km, that is 2,182 return trips to the Moon; 652 rotations of Earth; with the Sun — 13 billion km around the Galactic centre, 0.5 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 104 million km away; today it is 245 million km (farther by 2.4×).

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

    That day fell in solar cycle 25, near maximum (48% through the cycle).

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

    Mars returns to that day’s point of its orbit on November 8, 2026; Jupiter — in 2036; 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 72″ 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/ap241221.html

    NASA APOD

Other dates

2024-12-20 2024-12-22 everyone born December 21
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