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The sky on September 3, 2010 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–☽ 92.3°☽–♄ 91.5° ♃︎0° ☽︎2° ☉︎10° ☿︎10° ♄︎4° ♂︎22° ♀︎25°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 160.9° · sign Virgo · constellation Leo
  • ☽︎ Moon — 92.9° · sign Cancer · constellation Gemini
  • ☿︎ Mercury — 160.9° · sign Virgo · constellation Sextans
  • ♀︎ Venus — 205.9° · sign Libra · constellation Virgo
  • ♂︎ Mars — 202.4° · sign Libra · constellation Virgo
  • ♃︎ Jupiter — 0.7° · sign Aries · constellation Pisces
  • ♄︎ Saturn — 184.4° · sign Libra · constellation Virgo
  • ☽︎ Moon 31% 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, 31% lit; the Moon was 374,410 km away.

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

    16.1 orbits of the Sun — 15,122 million km, that is 19,669 return trips to the Moon; 5,877 rotations of Earth; with the Sun — 116.8 billion km around the Galactic centre, 4.5 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 323 million km away; today it is 243 million km (closer by 1.3×).

    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 (16% through the cycle).

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

    Mars returns to that day’s point of its orbit on August 8, 2027; Jupiter — in 2034; a full moon exactly on this date — September 2, 2039

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

    The vernal point has shifted 792″ 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/ap100903.html

    NASA APOD

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