The sky on September 13, 2008 — as it really was
That day the Sun stood in Leo, while the horoscope says "Virgo". The gap is 24.0° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 171.1° · sign Virgo · constellation Leo
- ☽︎ Moon — 327.8° · sign Aquarius · constellation Aquarius
- ☿︎ Mercury — 197.7° · sign Libra · constellation Virgo
- ♀︎ Venus — 197.0° · sign Libra · constellation Virgo
- ♂︎ Mars — 196.2° · sign Libra · constellation Virgo
- ♃︎ Jupiter — 282.6° · sign Capricorn · constellation Sagittarius
- ♄︎ Saturn — 163.1° · sign Virgo · constellation Leo
- ☽︎ Moon 96% 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, 96% lit; the Moon was 386,410 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
18.1 orbits of the Sun — 16,970 million km, that is 22,073 return trips to the Moon; 6,595 rotations of Earth; with the Sun — 131.1 billion km around the Galactic centre, 5.1 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 366 million km away; today it is 245 million km (closer by 1.5×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 23, on the decline (98% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on July 6, 2027; Jupiter — in 2032; a full moon exactly on this date — September 13, 2057
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 900″ since that day; the real constellations now sit 24° 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/ap080913.html
NASA APOD
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