The sky on January 17, 2002 — as it really was
That day the Sun stood in Sagittarius, while the horoscope says "Capricorn". The gap is 23.9° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 297.2° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon — 340.9° · sign Pisces · constellation Aquarius
- ☿︎ Mercury — 314.3° · sign Aquarius · constellation Capricornus
- ♀︎ Venus — 297.9° · sign Capricorn · constellation Sagittarius
- ♂︎ Mars — 358.9° · sign Pisces · constellation Pisces
- ♃︎ Jupiter — 98.5° · sign Cancer · constellation Gemini
- ♄︎ Saturn — 68.5° · sign Gemini · constellation Taurus
- ☽︎ Moon 14% 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, 14% lit; the Moon was 405,097 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
24.7 orbits of the Sun — 23,224 million km, that is 30,208 return trips to the Moon; 9,026 rotations of Earth; with the Sun — 179.4 billion km around the Galactic centre, 6.9 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 242 million km away; today it is 245 million km (farther by 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 (44% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on May 18, 2028; Jupiter — in 2038; a full moon exactly on this date — January 17, 2041
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 1,224″ 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/ap020117.html
NASA APOD
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