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The sky on September 16, 2013 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂–☿ 59.3°♂–☽ 177.9°☿–☽ 122.9° ♃︎16° ♂︎12° ☉︎23° ☿︎11° ♀︎6° ♄︎8° ☽︎14°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 173.8° · sign Virgo · constellation Leo
  • ☽︎ Moon — 314.4° · sign Aquarius · constellation Aquarius
  • ☿︎ Mercury — 191.6° · sign Libra · constellation Virgo
  • ♀︎ Venus — 216.0° · sign Scorpio · constellation Virgo
  • ♂︎ Mars — 132.3° · sign Leo · constellation Cancer
  • ♃︎ Jupiter — 106.5° · sign Cancer · constellation Gemini
  • ♄︎ Saturn — 218.5° · sign Scorpio · constellation Libra
  • ☽︎ Moon 89% 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 gibbous, 89% lit; the Moon was 367,696 km away.

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

    13.1 orbits of the Sun — 12,267 million km, that is 15,956 return trips to the Moon; 4,768 rotations of Earth; with the Sun — 94.7 billion km around the Galactic centre, 3.7 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 332 million km away; today it is 244 million km (closer by 1.4×).

    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 (44% through the cycle).

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

    Mars returns to that day’s point of its orbit on November 16, 2026; Jupiter — in 2037; a full moon exactly on this date — September 15, 2027

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

    The vernal point has shifted 648″ 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/ap130916.html

    NASA APOD

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