The sky on May 16, 2017 — as it really was
That day the Sun stood in Taurus — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 55.8° · sign Taurus · constellation Taurus
- ☽︎ Moon — 297.1° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 30.3° · sign Taurus · constellation Pisces
- ♀︎ Venus — 11.4° · sign Aries · constellation Pisces
- ♂︎ Mars — 77.1° · sign Gemini · constellation Taurus
- ♃︎ Jupiter — 194.1° · sign Libra · constellation Virgo
- ♄︎ Saturn — 266.6° · sign Sagittarius · constellation Sagittarius
- ☽︎ Moon 74% 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.
- The Moon that day [EXACT]
waning gibbous, 74% lit; the Moon was 400,393 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
9.4 orbits of the Sun — 8,821 million km, that is 11,474 return trips to the Moon; 3,428 rotations of Earth; with the Sun — 68.1 billion km around the Galactic centre, 2.6 light-days.
29.78 km/s along the orbit; 230 km/s around the Galactic centre - Mars then and now [EXACT]
On that day Mars was 369 million km away; today it is 245 million km (closer by 1.5×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 24, on the decline (77% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on October 11, 2026; Jupiter — in 2029; a full moon exactly on this date — May 16, 2041
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 468″ since that day; the real constellations now sit 24.1° away from the astrologers’ “signs”.
precession 50.29″/yr - Picture of the day [EXACT]
NASA Astronomy Picture of the Day for this date: apod.nasa.gov/apod/ap170516.html
NASA APOD
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