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The sky on August 20, 1976 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–☉ 87.8°♃–♂ 117.9°☽–☉ 62.1°☽–☿ 88.7°☽–♂ 92.1° ♃︎29° ☽︎25° ♄︎9° ☉︎27° ♀︎14° ☿︎24° ♂︎27°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 147.6° · sign Leo · constellation Leo
  • ☽︎ Moon — 85.5° · sign Gemini · constellation Taurus
  • ☿︎ Mercury — 174.2° · sign Virgo · constellation Virgo
  • ♀︎ Venus — 164.9° · sign Virgo · constellation Leo
  • ♂︎ Mars — 177.6° · sign Virgo · constellation Virgo
  • ♃︎ Jupiter — 59.7° · sign Taurus · constellation Taurus
  • ♄︎ Saturn — 129.3° · sign Leo · constellation Cancer
  • ☽︎ Moon 27% 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, 27% lit; the Moon was 393,478 km away.

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

    50.1 orbits of the Sun — 47,107 million km, that is 61,274 return trips to the Moon; 18,308 rotations of Earth; with the Sun — 363.8 billion km around the Galactic centre, 14 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 362 million km away; today it is 244 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, right at the minimum (4% through the cycle).

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

    Mars returns to that day’s point of its orbit on June 2, 2027; Jupiter — in 2035; a full moon exactly on this date — August 20, 2062

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

    The vernal point has shifted 2,520″ since that day; the real constellations now sit 23.5° away from the astrologers’ “signs”.

    precession 50.29″/yr

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