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The sky on February 21, 1971 — as it really was

That day the Sun stood in Aquarius, while the horoscope says "Pisces". The gap is 23.5° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♄–♀ 119.0°♃–☉ 87.1° ♄︎16° ♃︎5° ♂︎18° ☽︎8° ♀︎17° ☿︎21° ☉︎2°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 332.2° · sign Pisces · constellation Aquarius
  • ☽︎ Moon — 278.8° · sign Capricorn · constellation Sagittarius
  • ☿︎ Mercury — 321.6° · sign Aquarius · constellation Capricornus
  • ♀︎ Venus — 287.8° · sign Capricorn · constellation Sagittarius
  • ♂︎ Mars — 258.4° · sign Sagittarius · constellation Ophiuchus
  • ♃︎ Jupiter — 245.1° · sign Sagittarius · constellation Scorpius
  • ♄︎ Saturn — 46.8° · sign Taurus · constellation Aries
  • ☽︎ Moon 20% 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.

  1. The Moon that day [EXACT]

    waning crescent, 20% lit; the Moon was 373,477 km away.

    astronomy-engine
  2. How far Earth has travelled since [EXACT]

    55.6 orbits of the Sun — 52,268 million km, that is 67,986 return trips to the Moon; 20,314 rotations of Earth; with the Sun — 403.7 billion km around the Galactic centre, 15.6 light-days.

    29.78 km/s along the orbit; 230 km/s around the Galactic centre
  3. Mars then and now [EXACT]

    On that day Mars was 228 million km away; today it is 245 million km (farther by 1.1×).

    astronomy-engine; checked against JPL Horizons for 2026-09-14
  4. Solar cycle [ESTIMATE]

    That day fell in solar cycle 20, near maximum (56% through the cycle).

    SILSO smoothed minima
  5. When the sky repeats [EXACT]

    Mars returns to that day’s point of its orbit on July 26, 2027; Jupiter — in 2030; a full moon exactly on this date — February 20, 2027

    sidereal periods: Mars 686.98 d, Jupiter 11.862 yr
  6. How far the sky has drifted since [EXACT]

    The vernal point has shifted 2,772″ since that day; the real constellations now sit 23.5° away from the astrologers’ “signs”.

    precession 50.29″/yr

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