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The sky on April 28, 1981 — as it really was

That day the Sun stood in Aries, while the horoscope says "Taurus". The gap is 23.6° of precession.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♂︎2° ☉︎8° ☿︎9° ♀︎13° ♃︎1° ♄︎4° ☽︎21°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 38.1° · sign Taurus · constellation Aries
  • ☽︎ Moon — 321.1° · sign Aquarius · constellation Capricornus
  • ☿︎ Mercury — 39.1° · sign Taurus · constellation Aries
  • ♀︎ Venus — 43.6° · sign Taurus · constellation Aries
  • ♂︎ Mars — 32.4° · sign Taurus · constellation Aries
  • ♃︎ Jupiter — 181.7° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 184.1° · sign Libra · constellation Virgo
  • ☽︎ Moon 39% 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]

    last quarter, 39% lit; the Moon was 380,958 km away.

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

    45.4 orbits of the Sun — 42,699 million km, that is 55,540 return trips to the Moon; 16,595 rotations of Earth; with the Sun — 329.8 billion km around the Galactic centre, 12.7 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 363 million km away; today it is 245 million km (closer by 1.5×).

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

    That day fell in solar cycle 21, near maximum (49% through the cycle).

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

    Mars returns to that day’s point of its orbit on May 6, 2028; Jupiter — in 2028; a full moon exactly on this date — April 28, 2029

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

    The vernal point has shifted 2,268″ since that day; the real constellations now sit 23.6° away from the astrologers’ “signs”.

    precession 50.29″/yr

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