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The sky on May 15, 1972 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☿–♂ 57.9°☿–♀ 58.3° ☿︎4° ☉︎24° ♄︎7° ☽︎27° ♂︎1° ♀︎2° ♃︎7°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 54.7° · sign Taurus · constellation Taurus
  • ☽︎ Moon — 87.4° · sign Gemini · constellation Taurus
  • ☿︎ Mercury — 34.0° · sign Taurus · constellation Aries
  • ♀︎ Venus — 92.3° · sign Cancer · constellation Gemini
  • ♂︎ Mars — 91.9° · sign Cancer · constellation Gemini
  • ♃︎ Jupiter — 277.7° · sign Capricorn · constellation Sagittarius
  • ♄︎ Saturn — 67.9° · sign Gemini · constellation Taurus
  • ☽︎ Moon 8% 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]

    waxing crescent, 8% lit; the Moon was 364,626 km away.

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

    54.4 orbits of the Sun — 51,116 million km, that is 66,488 return trips to the Moon; 19,866 rotations of Earth; with the Sun — 394.8 billion km around the Galactic centre, 15.2 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 346 million km away; today it is 244 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 20, on the decline (67% through the cycle).

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

    Mars returns to that day’s point of its orbit on November 30, 2026; Jupiter — in 2031.

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

    The vernal point has shifted 2,736″ since that day; the real constellations now sit 23.5° away from the astrologers’ “signs”.

    precession 50.29″/yr

Other dates

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