The sky on May 1, 2021 — as it really was
That day the Sun stood in Aries, while the horoscope says "Taurus". The gap is 24.2° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 41.3° · sign Taurus · constellation Aries
- ☽︎ Moon — 281.8° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 55.1° · sign Taurus · constellation Aries
- ♀︎ Venus — 50.7° · sign Taurus · constellation Aries
- ♂︎ Mars — 94.9° · sign Cancer · constellation Gemini
- ♃︎ Jupiter — 328.4° · sign Aquarius · constellation Aquarius
- ♄︎ Saturn — 313.1° · sign Aquarius · constellation Capricornus
- ☽︎ Moon 75% 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, 75% lit; the Moon was 369,707 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
5.4 orbits of the Sun — 5,104 million km, that is 6,638 return trips to the Moon; 1,983 rotations of Earth; with the Sun — 39.4 billion km around the Galactic centre, 1.5 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 303 million km away; today it is 244 million km (closer by 1.2×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 25, right at the minimum (13% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on December 22, 2026; Jupiter — in 2033; a full moon exactly on this date — May 1, 2045
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 252″ since that day; the real constellations now sit 24.2° 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/ap210501.html
NASA APOD
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