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The sky on December 29, 2018 — as it really was

That day the Sun stood in Sagittarius, while the horoscope says "Capricorn". The gap is 24.1° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–♃ 62.2°☽–☉ 88.7°☽–♄ 92.1° ☽︎8° ♀︎21° ♃︎11° ☿︎20° ☉︎7° ♄︎11° ♂︎28°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 277.7° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon — 189.0° · sign Libra · constellation Virgo
  • ☿︎ Mercury — 260.2° · sign Sagittarius · constellation Ophiuchus
  • ♀︎ Venus — 231.1° · sign Scorpio · constellation Libra
  • ♂︎ Mars — 358.3° · sign Pisces · constellation Pisces
  • ♃︎ Jupiter — 251.2° · sign Sagittarius · constellation Ophiuchus
  • ♄︎ Saturn — 281.1° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon 49% 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, 49% lit; the Moon was 376,243 km away.

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

    7.8 orbits of the Sun — 7,299 million km, that is 9,494 return trips to the Moon; 2,837 rotations of Earth; with the Sun — 56.4 billion km around the Galactic centre, 2.2 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 185 million km away; today it is 245 million km (farther by 1.3×).

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

    That day fell in solar cycle 24, on the decline (92% through the cycle).

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

    Mars returns to that day’s point of its orbit on May 25, 2028; Jupiter — in 2030; a full moon exactly on this date — December 28, 2031

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

    The vernal point has shifted 396″ since that day; the real constellations now sit 24.1° 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/ap181229.html

    NASA APOD

Other dates

2018-12-28 2018-12-30 everyone born December 29
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