Retrograde in History · 1929

Saint Valentine's Day Massacre

On February 14, 1929, Mercury was mid-loop — retrograde in Aquarius, tracing backward through 10°29′ of the sign.

WhenFebruary 14, 1929♒︎Aquarius 10°29′Rx windowJan 29 – Feb 19, 1929
Mercury retrograde♒︎AquariusWikipedia
The record

February 1929 gang showdown in Chicago, Illinois, USA

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.