The sky on May 20, 2001 — as it really was
That day the Sun stood in Taurus — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 59.5° · sign Taurus · constellation Taurus
- ☽︎ Moon — 27.0° · sign Aries · constellation Pisces
- ☿︎ Mercury — 81.8° · sign Gemini · constellation Taurus
- ♀︎ Venus — 15.3° · sign Aries · constellation Pisces
- ♂︎ Mars — 268.6° · sign Sagittarius · constellation Sagittarius
- ♃︎ Jupiter — 77.8° · sign Gemini · constellation Taurus
- ♄︎ Saturn — 63.7° · sign Gemini · constellation Taurus
- ☽︎ Moon 8% 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 crescent, 8% lit; the Moon was 388,038 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
25.4 orbits of the Sun — 23,848 million km, that is 31,019 return trips to the Moon; 9,268 rotations of Earth; with the Sun — 184.2 billion km around the Galactic centre, 7.1 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 80 million km away; today it is 245 million km (farther by 3.1×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 23, on the rise to maximum (39% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on September 19, 2027; Jupiter — in 2037; a full moon exactly on this date — May 20, 2027
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 1,260″ 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/ap010520.html
NASA APOD
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