The Natal Registry · Science & Tech
Heinrich Louis d'Arrestborn under Mercury retrograde
German astronomer (1822–1875) — born July 13, 1822, while Mercury traced its backward loop through Cancer.
BornJuly 13, 1822(1822–1875)♋︎☿ Rx in Cancer · 21°35′Rx windowJun 30 – Jul 24, 1822
✶Astrological tradition — for entertainment, not astronomy
Tradition reads a natal Mercury retrograde as the inward mind — drafted, revised, doubled back — and gives it a water-sign keynote in Cancer: Family ghosts call; let old feelings finish their sentence.
Shares a retrograde sign with
Born inside the very same window
Coincidence, not causation: the birthday and the window are real and ephemeris-based; the reading is tradition, offered in good fun.