The sky on September 15, 2013 — as it really was
That day the Sun stood in Leo, while the horoscope says "Virgo". The gap is 24.1° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 172.8° · sign Virgo · constellation Leo
- ☽︎ Moon — 299.9° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 190.0° · sign Libra · constellation Virgo
- ♀︎ Venus — 214.9° · sign Scorpio · constellation Virgo
- ♂︎ Mars — 131.7° · sign Leo · constellation Cancer
- ♃︎ Jupiter — 106.3° · sign Cancer · constellation Gemini
- ♄︎ Saturn — 218.4° · sign Scorpio · constellation Libra
- ☽︎ Moon 80% 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.
- The Moon that day [EXACT]
waxing gibbous, 80% lit; the Moon was 367,397 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
13.1 orbits of the Sun — 12,270 million km, that is 15,960 return trips to the Moon; 4,769 rotations of Earth; with the Sun — 94.8 billion km around the Galactic centre, 3.7 light-days.
29.78 km/s along the orbit; 230 km/s around the Galactic centre - Mars then and now [EXACT]
On that day Mars was 333 million km away; today it is 244 million km (closer by 1.4×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 24, on the rise to maximum (44% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on November 15, 2026; Jupiter — in 2037; a full moon exactly on this date — September 15, 2046
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - 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 - Picture of the day [EXACT]
NASA Astronomy Picture of the Day for this date: apod.nasa.gov/apod/ap130915.html
NASA APOD
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