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The sky on May 18, 2003 — as it really was

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

РЫБЫОВЕНТЕЛЕЦБЛИЗНЕЦЫРАКЛЕВДЕВАВЕСЫСКОРПИОНЗМЕЕНОСЕЦСТРЕЛЕЦКОЗЕРОГВОДОЛЕЙ ♈︎♉︎♊︎♋︎♌︎♍︎♎︎♏︎♐︎♑︎♒︎♓︎ ♀–☽ 122.5°☿–♃ 89.7°♄–☽ 178.0° ♀︎2° ☿︎11° ☉︎27° ♄︎27° ♃︎10° ☽︎29° ♂︎15°

Bodies on the ecliptic (noon UTC)

  • ☉︎ Sun — 57.1° · sign Taurus · constellation Taurus
  • ☽︎ Moon — 270.0° · sign Sagittarius · constellation Sagittarius
  • ☿︎ Mercury — 41.2° · sign Taurus · constellation Aries
  • ♀︎ Venus — 32.5° · sign Taurus · constellation Aries
  • ♂︎ Mars — 315.3° · sign Aquarius · constellation Capricornus
  • ♃︎ Jupiter — 130.9° · sign Leo · constellation Cancer
  • ♄︎ Saturn — 88.0° · sign Gemini · constellation Orion
  • ☽︎ Moon 92% 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 gibbous, 92% lit; the Moon was 364,861 km away.

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

    23.4 orbits of the Sun — 21,974 million km, that is 28,582 return trips to the Moon; 8,540 rotations of Earth; with the Sun — 169.7 billion km around the Galactic centre, 6.6 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 128 million km away; today it is 245 million km (farther by 1.9×).

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

    That day fell in solar cycle 23, near maximum (55% through the cycle).

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

    Mars returns to that day’s point of its orbit on October 30, 2027; Jupiter — in 2027.

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

    The vernal point has shifted 1,152″ 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/ap030518.html

    NASA APOD

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