A type of asvādhyāyika (the interdiction of doing Svādhyāya (scriptural studies and teaching) in a particular time or place));
those situations, related to the events of intersteller space like falling of meteor, in which Svādhyāya of Āgamas (canonical works) is interdicted.
dasavidhe aṃtalikkhae asajjhāie paṇṇatte tam jahā-ukkāvāte, disidāghe, gajjite, vijjute, nigghāte, juvae, jakkhālitte, dhūmiyā, mahiyā, rayugghāte.
(Sthā 10.20)