The Cosmic Calendar is the calendar by which the galaxy operates. Mentioned in the Metroid: Zero Mission manual, it is said that two events occurred in the Cosmic Calendar, the forming of the Galactic Federation in 2003, and the attack on the Space Research Vessel Marina and the events leading up to Samus Aran's Zero Mission in the Year 20X5. The Metroid Prime Trilogy manual refers to the calendar as the Cosmo Dating System.

In the manuals for the original Metroid, as well as Metroid II: Return of Samus, the forming of the Federation took place in 2000 "of the cosmos," and the Cosmic Calendar is not mentioned.

Related QuotesEdit

"In the year 2003 of the Cosmic Calendar, representatives from the many different planets in the galaxy established a congress called the Galactic Federation, and an age of prosperity began." - Zero Mission

"In the year 20X5 of the Cosmic Calendar, a terrible incident occurred." - Zero Mission

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