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The sky on May 18, 2001 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ☽–♄ 61.8°☽–♂ 92.9° ☽︎1° ♀︎13° ☉︎27° ♄︎3° ♃︎17° ☿︎19° ♂︎28°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 57.6° · sign Taurus · constellation Taurus
  • ☽︎ Moon — 1.7° · sign Aries · constellation Pisces
  • ☿︎ Mercury — 79.5° · sign Gemini · constellation Taurus
  • ♀︎ Venus — 13.8° · sign Aries · constellation Pisces
  • ♂︎ Mars — 268.8° · sign Sagittarius · constellation Sagittarius
  • ♃︎ Jupiter — 77.3° · sign Gemini · constellation Taurus
  • ♄︎ Saturn — 63.5° · sign Gemini · constellation Taurus
  • ☽︎ Moon 22% 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, 22% lit; the Moon was 396,951 km away.

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

    25.4 orbits of the Sun — 23,853 million km, that is 31,026 return trips to the Moon; 9,270 rotations of Earth; with the Sun — 184.2 billion km around the Galactic centre, 7.1 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 82 million km away; today it is 245 million km (farther by 3×).

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

    That day fell in solar cycle 23, on the rise to maximum (39% through the cycle).

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

    Mars returns to that day’s point of its orbit on September 17, 2027; Jupiter — in 2037.

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

    The vernal point has shifted 1,260″ since that day; the real constellations now sit 23.9° away from the astrologers’ “signs”.

    precession 50.29″/yr
  7. Picture of the day [EXACT]

    NASA Astronomy Picture of the Day for this date: apod.nasa.gov/apod/ap010518.html

    NASA APOD

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