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The sky on January 17, 2006 — as it really was

That day the Sun stood in Sagittarius, while the horoscope says "Capricorn". The gap is 23.9° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–♃ 179.5° ♂︎16° ♄︎8° ☽︎1° ♃︎15° ☿︎21° ♀︎21° ☉︎27°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 297.2° · sign Capricorn · constellation Sagittarius
  • ☽︎ Moon — 151.1° · sign Virgo · constellation Leo
  • ☿︎ Mercury — 291.2° · sign Capricorn · constellation Sagittarius
  • ♀︎ Venus — 291.5° · sign Capricorn · constellation Sagittarius
  • ♂︎ Mars — 46.2° · sign Taurus · constellation Aries
  • ♃︎ Jupiter — 225.7° · sign Scorpio · constellation Libra
  • ♄︎ Saturn — 128.7° · sign Leo · constellation Cancer
  • ☽︎ Moon 92% 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, 92% lit; the Moon was 405,832 km away.

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

    20.7 orbits of the Sun — 19,467 million km, that is 25,322 return trips to the Moon; 7,566 rotations of Earth; with the Sun — 150.4 billion km around the Galactic centre, 5.8 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 138 million km away; today it is 245 million km (farther by 1.8×).

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

    That day fell in solar cycle 23, on the decline (77% through the cycle).

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

    Mars returns to that day’s point of its orbit on August 13, 2028; Jupiter — in 2030; a full moon exactly on this date — January 17, 2041

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

    The vernal point has shifted 1,044″ since that day; the real constellations now sit 23.9° 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/ap060117.html

    NASA APOD

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