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The sky on July 22, 1975 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♃–♄ 89.6°☿–☽ 177.2°♄–☽ 177.3° ♃︎23° ♂︎14° ☿︎17° ♄︎23° ☉︎29° ♀︎7° ☽︎20°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 119.1° · sign Cancer · constellation Cancer
  • ☽︎ Moon — 290.7° · sign Capricorn · constellation Sagittarius
  • ☿︎ Mercury — 107.9° · sign Cancer · constellation Gemini
  • ♀︎ Venus — 158.0° · sign Virgo · constellation Leo
  • ♂︎ Mars — 44.8° · sign Taurus · constellation Aries
  • ♃︎ Jupiter — 23.8° · sign Aries · constellation Pisces
  • ♄︎ Saturn — 113.4° · sign Cancer · constellation Gemini
  • ☽︎ Moon 99% 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]

    full moon, 99% lit; the Moon was 395,304 km away.

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

    51.2 orbits of the Sun — 48,123 million km, that is 62,595 return trips to the Moon; 18,703 rotations of Earth; with the Sun — 371.7 billion km around the Galactic centre, 14.3 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 190 million km away; today it is 244 million km (farther by 1.3×).

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

    That day fell in solar cycle 20, on the decline (95% through the cycle).

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

    Mars returns to that day’s point of its orbit on March 20, 2028; Jupiter — in 2034; a full moon exactly on this date — July 22, 2043

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

    The vernal point has shifted 2,556″ since that day; the real constellations now sit 23.5° away from the astrologers’ “signs”.

    precession 50.29″/yr

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