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The sky on September 7, 2015 — as it really was

That day the Sun stood in Leo, while the horoscope says "Virgo". The gap is 24.1° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☿ 91.5° ☽︎9° ♀︎14° ♂︎18° ♃︎5° ☉︎14° ☿︎11° ♄︎29°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 164.6° · sign Virgo · constellation Leo
  • ☽︎ Moon — 99.8° · sign Cancer · constellation Gemini
  • ☿︎ Mercury — 191.3° · sign Libra · constellation Virgo
  • ♀︎ Venus — 134.4° · sign Leo · constellation Cancer
  • ♂︎ Mars — 138.9° · sign Leo · constellation Leo
  • ♃︎ Jupiter — 155.9° · sign Virgo · constellation Leo
  • ♄︎ Saturn — 239.3° · sign Scorpio · constellation Libra
  • ☽︎ Moon 29% 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 crescent, 29% lit; the Moon was 390,686 km away.

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

    11.1 orbits of the Sun — 10,410 million km, that is 13,541 return trips to the Moon; 4,046 rotations of Earth; with the Sun — 80.4 billion km around the Galactic centre, 3.1 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 372 million km away; today it is 245 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, on the decline (62% through the cycle).

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

    Mars returns to that day’s point of its orbit on December 20, 2026; Jupiter — in 2027; a full moon exactly on this date — September 7, 2044

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

    The vernal point has shifted 540″ since that day; the real constellations now sit 24.1° 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/ap150907.html

    NASA APOD

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