The sky on September 18, 2004 — as it really was
That day the Sun stood in Virgo — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 175.9° · sign Virgo · constellation Virgo
- ☽︎ Moon — 224.7° · sign Scorpio · constellation Libra
- ☿︎ Mercury — 161.8° · sign Virgo · constellation Leo
- ♀︎ Venus — 132.7° · sign Leo · constellation Cancer
- ♂︎ Mars — 174.9° · sign Virgo · constellation Virgo
- ♃︎ Jupiter — 178.6° · sign Virgo · constellation Virgo
- ♄︎ Saturn — 115.1° · sign Cancer · constellation Gemini
- ☽︎ Moon 17% 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 crescent, 17% lit; the Moon was 374,336 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
22 orbits of the Sun — 20,717 million km, that is 26,947 return trips to the Moon; 8,052 rotations of Earth; with the Sun — 160 billion km around the Galactic centre, 6.2 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 398 million km away; today it is 245 million km (closer by 1.6×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 23, on the decline (66% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on April 15, 2027; Jupiter — in 2028; a full moon exactly on this date — September 17, 2035
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 1,080″ since that day; the real constellations now sit 23.9° 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/ap040918.html
NASA APOD
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