The sky on September 21, 1977 — as it really was
That day the Sun stood in Virgo — sign and constellation agree here.
Bodies on the ecliptic (noon UTC)
- ☉︎ Sun — 178.4° · sign Virgo · constellation Virgo
- ☽︎ Moon — 284.7° · sign Capricorn · constellation Sagittarius
- ☿︎ Mercury — 160.5° · sign Virgo · constellation Leo
- ♀︎ Venus — 148.6° · sign Leo · constellation Leo
- ♂︎ Mars — 102.2° · sign Cancer · constellation Gemini
- ♃︎ Jupiter — 94.4° · sign Cancer · constellation Gemini
- ♄︎ Saturn — 145.2° · sign Leo · constellation Leo
- ☽︎ Moon 64% 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]
first quarter, 64% lit; the Moon was 371,772 km away.
astronomy-engine - How far Earth has travelled since [EXACT]
49 orbits of the Sun — 46,083 million km, that is 59,941 return trips to the Moon; 17,910 rotations of Earth; with the Sun — 355.9 billion km around the Galactic centre, 13.7 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 206 million km away; today it is 245 million km (farther by 1.2×).
astronomy-engine; checked against JPL Horizons for 2026-09-14 - Solar cycle [ESTIMATE]
That day fell in solar cycle 21, right at the minimum (15% through the cycle).
SILSO smoothed minima - When the sky repeats [EXACT]
Mars returns to that day’s point of its orbit on July 3, 2028; Jupiter — in 2036; a full moon exactly on this date — September 20, 2040
sidereal periods: Mars 686.98 d, Jupiter 11.862 yr - How far the sky has drifted since [EXACT]
The vernal point has shifted 2,448″ since that day; the real constellations now sit 23.6° away from the astrologers’ “signs”.
precession 50.29″/yr
Other dates
Computed from the date only; nothing about you is stored.