The sky on March 13, 2009 — as it really was
That day the Sun stood in Pisces — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 353.0° · sign Pisces · constellation Pisces
- ☽︎ Moon — 203.2° · sign Libra · constellation Virgo
- ☿︎ Mercury — 337.7° · sign Pisces · constellation Aquarius
- ♀︎ Venus — 14.5° · sign Aries · constellation Pisces
- ♂︎ Mars — 328.7° · sign Aquarius · constellation Aquarius
- ♃︎ Jupiter — 315.4° · sign Aquarius · constellation Capricornus
- ♄︎ Saturn — 168.0° · sign Virgo · constellation Leo
- ☽︎ Moon 93% 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]
waning gibbous, 93% lit; the Moon was 384,500 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
17.6 orbits of the Sun — 16,504 million km, that is 21,467 return trips to the Moon; 6,414 rotations of Earth; with the Sun — 127.5 billion km around the Galactic centre, 4.9 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 335 million km away; today it is 245 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, right at the minimum (3% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on January 3, 2028; Jupiter — in 2033; a full moon exactly on this date — March 13, 2055
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 864″ 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/ap090313.html
NASA APOD
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