Relating to or describing a Cassegrain telescope or its optical design principle.
An adjectival form derived from Cassegrain (the telescope type), with the suffix '-ian' added to create the adjective form, following standard English word formation for optical and astronomical terms.
The term 'Cassegrainian' appears in astronomy papers to describe hundreds of modern telescopes—from amateur observatories to the Hubble Space Telescope's design—showing how one 17th-century priest's optical insight became the template for humanity's most powerful eyes on the universe.
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