Retrograde in History · 2017

2017 shooting of Paris police officers

On April 20, 2017, Mercury was mid-loop — retrograde in Taurus, tracing backward through 0°10′ of the sign.

WhenApril 20, 2017♉︎Taurus 0°10′Rx windowApr 9 – May 3, 2017
Mercury retrograde♉︎TaurusCazimiWikipedia
The record

terrorist attack in Paris

More from this window · Apr 9 – May 3, 2017

Coincidence, not causation: the date is real and ephemeris-based, but a retrograde window is observed, never blamed. For entertainment, not navigation.