The sky on April 13, 1997 — as it really was
That day the Sun stood in Pisces, while the horoscope says "Aries". The gap is 23.8° of precession.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 23.6° · sign Aries · constellation Pisces
- ☽︎ Moon — 99.9° · sign Cancer · constellation Gemini
- ☿︎ Mercury — 39.5° · sign Taurus · constellation Aries
- ♀︎ Venus — 26.4° · sign Aries · constellation Pisces
- ♂︎ Mars — 168.1° · sign Virgo · constellation Leo
- ♃︎ Jupiter — 317.1° · sign Aquarius · constellation Capricornus
- ♄︎ Saturn — 11.9° · sign Aries · constellation Pisces
- ☽︎ Moon 38% 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]
first quarter, 38% lit; the Moon was 394,793 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
29.5 orbits of the Sun — 27,701 million km, that is 36,031 return trips to the Moon; 10,766 rotations of Earth; with the Sun — 213.9 billion km around the Galactic centre, 8.3 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 107 million km away; today it is 246 million km (farther by 2.3×).
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 May 18, 2027; Jupiter — in 2033; a full moon exactly on this date — April 13, 2063
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/ap970413.html
NASA APOD
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