Sky on May 21, 1999: where the Sun, Moon and planets really were

The real sky on May 21, 1999: Sun in Taurus (horoscope says "Gemini"), Moon 42% lit, planet positions from ephemerides.

The sky on May 21, 1999 — as it really was

That day the Sun stood in Taurus, while the horoscope says "Gemini". The gap is 23.9° of precession.

astronomy-engine ephemerides (VSOP87/ELP), IAU 1930 constellation boundaries. Positions accurate to a fraction of a degree.

Checkable facts with a tag and a source; the classical reading is in the chart.

The Moon that day [EXACT]
first quarter, 42% lit; the Moon was 381,750 km away.
astronomy-engine
How far Earth has travelled since [EXACT]
27.4 orbits of the Sun — 25,725 million km, that is 33,461 return trips to the Moon; 9,998 rotations of Earth; with the Sun — 198.7 billion km around the Galactic centre, 7.7 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 92 million km away; today it is 246 million km (farther by 2.7×).
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 (23% through the cycle).
SILSO smoothed minima
When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on August 7, 2027; Jupiter — in 2035.
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr
How far the sky has drifted since [EXACT]
The vernal point has shifted 1,368″ 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/ap990521.html
NASA APOD

Computed from the date only; nothing about you is stored.