This article is about a non-fiction entity related to the Astronist belief system or the Astronic tradition.
Any article relating to a fictional entity will be clearly marked as being part of the Spacefaring World.
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The Standard Astronomical Calendar (abbreviated: SAC), also known as the Astronian calendar, or more colloquially as the Astronist calendar, is the calendar used and disseminated by the Astronist Institution as founded by the philosopher Cometan. It is oriented on the moment of Yuri Gagarin's first entrance into space which occurred on 12th April 1961.