An Echo is an alternate reality that is nearly identical to a point in Homeline's past.
All books set in historical periods can be treated as Echo realties. Many cover huge periods of history:
- GURPS Arabian Nights: events 8000 BCE to 1307 with emphasis on the Golden Age of Islam
- GURPS Aztecs: events in Mesoamerica 8000 BCE to 1525
- GURPS Greece: Greece 1100 to 323 BCE
- The Last Spartan from GURPS All-Star Jam 2004.
- GURPS Dinosaurs: c 541 Million - 11,700 years ago
- GURPS Imperial Rome: Rome and its empire 753 BCE to 476 CE
- GURPS Middle Ages 1: Medieval (650 to 1485) England
- GURPS Crusades: (1054 to 1291)
- GURPS Japan: Japan 1457 to 1868
- GURPS Swashbucklers: 1559 to 1815
- GURPS Old West: United States 1800 to 1900
- GURPS WWII: 1918-1945
- GURPS Cops: 1667 to 2001
- Renaissance: Several GURPS books (14th to 17th century)
- "Airships" in GURPS All-Star Jam 2004: 1852 to 1937
Important Note[]
"Infinity names echoes based on the number of years the echo’s local present lags behind Homeline"[1]
For example "An echo with a local present date of 1776 would be Echo 251, or 251 Minus (both names get used interchangeably), since 1776 is 251 years behind Homeline’s present date of 2027."[2]
So something like "Echo -222" would NOT be an Echo of 222 BCE but rather an Echo of whatever is 222 years behind Homeline’s present date of 2027 or 1805.