Retrograde in History · 1939
Einstein–Szilárd letter
On August 2, 1939, Mercury was mid-loop — retrograde in Leo, tracing backward through 22°50′ of the sign.
WhenAugust 2, 1939♌︎Leo 22°50′Rx windowJul 27 – Aug 20, 1939
The record
On August 2, 1939, Leó Szilárd and Albert Einstein sent a letter to President Franklin D. Roosevelt warning that Germany might develop atomic bombs, which prompted the creation of the Manhattan Project.
Born inside this same window
Coincidence, not causation: the date is real and ephemeris-based, but a retrograde window is observed, never blamed. For entertainment, not navigation.