Known Realities

This is the number of realities known by Homeline and Centrum. Italics are extrapolated from both Classic and 4e material.
==Table of Known Realities==
Designation 	Q3	Q4	Q5	Q6/Echos 	Q7 	Q8 	Q9 	Q10 	Accessable	Total
Classic Homeline (2015)Classic: Time Travel p. 87 	25	87	68	377/281 	102 	~45	40 	40 	659 	784
Classic Centrum (2015)Knows of ~600 realities total; Classic Alternate Worlds 2 pg 115	U 	U 	U 	~410/~308	~100	46 	40-50	40-50	~646 	~646
4e Homeline (2027)Basic Set 526; 544-545 	39	89	68	379/281 	128 	45 	43 	52 	703 	843
4e Centrum (2027)Infinite Worlds p. 48-53; no firm numbers given 	U 	U 	U 	379/281 	~100	45 	43-50	52 	~619 	~619
Described in sourcebooks 	35	34	53	56 	40 	5 	None 	None 	N/A 	223
==Echo Information==
Until the discovery of Centrum Beta (apparently an Quantum 7 echo of Centrum), it was thought that only Homeline had echoes. Furthermore, it is theorized that some echoes "drift" into quantum rangeInfinite Worlds p. 21. Echoes range from 12000 BCE to present, a few before 3000 BCE, and 19 in the 17th centuryClassic: Time Travel p. 87-88  
Some echoes can shift to quantum when changes to their history occur while other echoes ("anchors") cannot be shifted. Anchor echoes are sometimes viewed as close parallels. Echoes that shift or are shown to be an anchor are usually given new names.Infinite Worlds p. 85 It is unclear whether former echoes are included in this total.
Twenty-Four Echoes have "vanished" from Quantum 6. Four shifted to Quantum 5; eleven have moved to Quantum 7 (six of which were due to Centrum influence); one (Engstrom) shifted to Quantum 4 and seven have not been rediscovered. One reality was shifted to Quantum 7 by Centrum but was returned to Quantum 6 by isolated I-Cops.
==Quick Reference Table==
Alpha is a proto version of Homeline that also had actual time travel and a limited WWIII in 1992.
Event 	23 Skidoo	Classic: Time Travel 	InfiniteWorlds
OTL Date 	N/G 	1991 	2005
Parachronic/Sideskippinginvented	1991 	1994 	1994
Invention Revealed 	1999 	1998 	1998
Centrum learnsof Homeline 	N/A 	2003Classic: Alternate Earths 2 pg 121	2015GURPS Infinite Worlds p. 48
Homeline learnsof Centrum 	N/A 	2006Classic: Time Travel p. 104 	2018GURPS Infinite Worlds p 8
Alpha/Homeline Present 	2006 	2015 	2027GURPS Infinite Worlds p. 46; 23 years "ahead" of OTL's present
Centrum Present 	N/A 	2015 	2027
==Notes==
#Things have settled down to about 10 new realities discovered each year so Classic Homeline should have ~120 more timelines in its 2027 rather the ~59 4e Homeline does.
#Q5 totals include Homeline (Classic: Time Travel p. 87; Basic Set 526)
#Engstrom, formerly an echo from Q6, is not included in the above counts.
#Quantum 6 numbers are total/Echos (B544)
#Four Quantum 6 echoes have moved to Quantum 5.Classic: Time Travel p. 88 Two of these were due to Centrum efforts to move the reality closer to them but the calculations weren't correct.Infinite Worlds pg 54
#Information about Quantum 7 and higher comes from captured Centrum agents.
==References==
Category:Setting Concepts
Category:Alternate Realities