The sky on January 30, 2018 — as it really was
That day the Sun stood in Capricornus, while the horoscope says "Aquarius". The gap is 24.1° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 310.5° · sign Aquarius · constellation Capricornus
- ☽︎ Moon — 115.7° · sign Cancer · constellation Gemini
- ☿︎ Mercury — 298.3° · sign Capricorn · constellation Sagittarius
- ♀︎ Venus — 315.6° · sign Aquarius · constellation Capricornus
- ♂︎ Mars — 242.4° · sign Sagittarius · constellation Libra
- ♃︎ Jupiter — 231.1° · sign Scorpio · constellation Libra
- ♄︎ Saturn — 274.7° · sign Capricorn · constellation Sagittarius
- ☽︎ Moon 98% 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]
full moon, 98% lit; the Moon was 358,990 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
8.7 orbits of the Sun — 8,155 million km, that is 10,607 return trips to the Moon; 3,169 rotations of Earth; with the Sun — 63 billion km around the Galactic centre, 2.4 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 252 million km away; today it is 245 million km (closer by 1×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 24, on the decline (83% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on June 27, 2027; Jupiter — in 2030; a full moon exactly on this date — January 30, 2029
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 432″ since that day; the real constellations now sit 24.1° 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/ap180130.html
NASA APOD
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