The sky on May 20, 1997 — 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 — 216.8° · sign Scorpio · constellation Libra
- ☿︎ Mercury — 34.5° · sign Taurus · constellation Cetus
- ♀︎ Venus — 72.0° · sign Gemini · constellation Taurus
- ♂︎ Mars — 169.6° · sign Virgo · constellation Leo
- ♃︎ Jupiter — 321.3° · sign Aquarius · constellation Capricornus
- ♄︎ Saturn — 16.2° · sign Aries · constellation Pisces
- ☽︎ 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 391,150 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
29.4 orbits of the Sun — 27,607 million km, that is 35,910 return trips to the Moon; 10,730 rotations of Earth; with the Sun — 213.2 billion km around the Galactic centre, 8.2 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 142 million km away; today it is 245 million km (farther by 1.7×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 23, right at the minimum (6% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on June 24, 2027; Jupiter — in 2033; 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 1,476″ since that day; the real constellations now sit 23.8° 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/ap970520.html
NASA APOD
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