The sky on June 21, 1940 — as it really was
That day the Sun stood in Gemini — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 89.9° · sign Gemini · constellation Gemini
- ☽︎ Moon — 289.0° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 115.0° · sign Cancer · constellation Gemini
- ♀︎ Venus — 98.3° · sign Cancer · constellation Gemini
- ♂︎ Mars — 112.4° · sign Cancer · constellation Gemini
- ♃︎ Jupiter — 37.6° · sign Taurus · constellation Aries
- ♄︎ Saturn — 41.2° · sign Taurus · constellation Aries
- ☽︎ Moon 97% 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]
full moon, 97% lit; the Moon was 386,374 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
86.3 orbits of the Sun — 81,090 million km, that is 105,476 return trips to the Moon; 31,516 rotations of Earth; with the Sun — 626.3 billion km around the Galactic centre, 24.2 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 380 million km away; today it is 246 million km (closer by 1.5×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on December 28, 2026; Jupiter — in 2035; a full moon exactly on this date — June 20, 2035
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 4,320″ since that day; the real constellations now sit 23° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.