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The sky on August 22, 1981 — as it really was

That day the Sun stood in Leo — sign and constellation agree here.

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–☉ 91.2° ☽︎28° ♂︎23° ☉︎29° ☿︎11° ♀︎4° ♄︎7° ♃︎9°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 149.3° · sign Leo · constellation Leo
  • ☽︎ Moon — 58.0° · sign Taurus · constellation Taurus
  • ☿︎ Mercury — 161.0° · sign Virgo · constellation Leo
  • ♀︎ Venus — 184.7° · sign Libra · constellation Virgo
  • ♂︎ Mars — 113.2° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 189.8° · sign Libra · constellation Virgo
  • ♄︎ Saturn — 187.6° · sign Libra · constellation Virgo
  • ☽︎ Moon 51% 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, 51% lit; the Moon was 369,755 km away.

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

    45.1 orbits of the Sun — 42,401 million km, that is 55,152 return trips to the Moon; 16,479 rotations of Earth; with the Sun — 327.5 billion km around the Galactic centre, 12.6 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 340 million km away; today it is 245 million km (closer by 1.4×).

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

    That day fell in solar cycle 21, near maximum (52% through the cycle).

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

    Mars returns to that day’s point of its orbit on October 13, 2026; Jupiter — in 2028; a full moon exactly on this date — August 22, 2040

    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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