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The sky on August 31, 2011 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–☉ 117.4°♃–♀ 121.5° ♃︎10° ♂︎18° ☿︎20° ☉︎7° ♀︎11° ☽︎10° ♄︎15°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 157.8° · sign Virgo · constellation Leo
  • ☽︎ Moon — 191.0° · sign Libra · constellation Virgo
  • ☿︎ Mercury — 140.1° · sign Leo · constellation Leo
  • ♀︎ Venus — 161.9° · sign Virgo · constellation Leo
  • ♂︎ Mars — 108.4° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 40.4° · sign Taurus · constellation Aries
  • ♄︎ Saturn — 195.1° · sign Libra · constellation Virgo
  • ☽︎ 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 361,316 km away.

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

    15.1 orbits of the Sun — 14,185 million km, that is 18,451 return trips to the Moon; 5,513 rotations of Earth; with the Sun — 109.6 billion km around the Galactic centre, 4.2 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 298 million km away; today it is 245 million km (closer by 1.2×).

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

    That day fell in solar cycle 24, on the rise to maximum (25% through the cycle).

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

    Mars returns to that day’s point of its orbit on August 4, 2028; Jupiter — in 2035; a full moon exactly on this date — August 31, 2042

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

    The vernal point has shifted 756″ 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/ap110831.html

    NASA APOD

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