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Published: 1st September 2021

Citation: Astronist Institution. (2021). Sesquianism. Available: Last accessed [enter date e.g. 1st Sept 2021].


noun  Astroeschatology

the assertion that the Humanic Exploration of The Cosmos must have begun by midway through the twenty-second century unless the Degradation of humanity will occur.


Sesquian | ˈ sɛskwiən | adjective & noun


Astro-English: from Astronese, the prefix sesqui- denotes “one and a half”; with the addition of the suffix -ianism denoting “a formalised belief”, the result is “the belief that the scope window will closure sometime before midway through the 22nd century” when taken from the perspective of when sesquianism was first theorised at the beginning of the 21st century.

Encyclopaedic entry for “Stellaren” on

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