City history
Discover the temporal evolution of Philadelphia, from its origins as a Quaker settlement to its role as a foundational center for American democracy and standardized timekeeping.
Chapter one
Earliest documented name
"Brotherly Love"
No specific indigenous name for the city site is reliably documented; the earliest historical name is Philadelphia, founded in 1682 by William Penn.
Brotherly Love
Named by William Penn to reflect the Quaker principles of peace and communal respect among all people residing in the settlement.
Chapter two
Following the railroad industry's lead, Philadelphia transitioned from local solar time to Eastern Standard Time to ensure synchronization across regional rail networks.
The United States implemented Daylight Saving Time for the first time during World War I, a practice Philadelphia has since largely continued to observe.
Chapter three
William Penn established the city as a refuge for Quakers, designing it with a grid system that heavily influenced subsequent American urban planning.
The city served as the epicenter of the American Revolution, hosting the Continental Congress and the signing of the nation's founding document.
The city boundaries were significantly expanded, merging several surrounding districts and townships into one unified municipal government for the entire region.
Philadelphia transitioned from gas to electric street lighting, which fundamentally changed the city's nocturnal rhythms and the temporal patterns of daily life.