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The sky on August 12, 2009 — as it really was

That day the Sun stood in Leo — sign and constellation agree here.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–☉ 58.5°♂–♄ 89.2°♂–♃ 119.1°♀–☿ 61.2°☉–♃ 177.6° ☽︎3° ♂︎21° ♀︎13° ☉︎19° ☿︎14° ♄︎20° ♃︎22°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 139.9° · sign Leo · constellation Leo
  • ☽︎ Moon — 33.9° · sign Taurus · constellation Aries
  • ☿︎ Mercury — 164.5° · sign Virgo · constellation Leo
  • ♀︎ Venus — 103.3° · sign Cancer · constellation Gemini
  • ♂︎ Mars — 81.4° · sign Gemini · constellation Taurus
  • ♃︎ Jupiter — 322.4° · sign Aquarius · constellation Capricornus
  • ♄︎ Saturn — 170.6° · sign Virgo · constellation Leo
  • ☽︎ 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 384,374 km away.

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

    17.1 orbits of the Sun — 16,115 million km, that is 20,961 return trips to the Moon; 6,263 rotations of Earth; with the Sun — 124.5 billion km around the Galactic centre, 4.8 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 256 million km away; today it is 244 million km (closer by 1×).

    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 (6% through the cycle).

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

    Mars returns to that day’s point of its orbit on June 3, 2028; Jupiter — in 2033; a full moon exactly on this date — August 12, 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 864″ 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/ap090812.html

    NASA APOD

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