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The sky on December 30, 2008 — as it really was

That day the Sun stood in Sagittarius, while the horoscope says "Capricorn". The gap is 24.0° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄︎21° ♂︎2° ☉︎9° ☿︎27° ♃︎28° ☽︎11° ♀︎25°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 279.2° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon — 311.6° · sign Aquarius · constellation Capricornus
  • ☿︎ Mercury — 297.5° · sign Capricorn · constellation Sagittarius
  • ♀︎ Venus — 325.6° · sign Aquarius · constellation Capricornus
  • ♂︎ Mars — 272.4° · sign Capricorn · constellation Sagittarius
  • ♃︎ Jupiter — 298.6° · sign Capricorn · constellation Sagittarius
  • ♄︎ Saturn — 171.8° · sign Virgo · constellation Leo
  • ☽︎ Moon 8% 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]

    waxing crescent, 8% lit; the Moon was 402,119 km away.

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

    17.8 orbits of the Sun — 16,694 million km, that is 21,714 return trips to the Moon; 6,488 rotations of Earth; with the Sun — 128.9 billion km around the Galactic centre, 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 364 million km away; today it is 244 million km (closer by 1.5×).

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

    That day fell in solar cycle 24, right at the minimum (1% through the cycle).

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

    Mars returns to that day’s point of its orbit on October 22, 2027; Jupiter — in 2032; a full moon exactly on this date — December 29, 2058

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

    The vernal point has shifted 900″ since that day; the real constellations now sit 24° 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/ap081230.html

    NASA APOD

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