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## Chapter 18:
**18. Anadhyayakala:** When a great king or a national leader passes away, one should not perform *svadhyaya* until their cremation is completed. Alternatively, one should gradually resume *svadhyaya* only after a new authority takes over.
**19. Rajavyudgraha:** When neighboring kings are engaged in war, one should not perform *svadhyaya* for a day and night even after peace is restored.
**20. Audarik Sharira:** When a five-sense being dies within the confines of an *upaashraya*, one should not perform *svadhyaya* as long as the body remains there. Similarly, if the lifeless body lies within a radius of 100 hands, *svadhyaya* should be avoided. These ten reasons for avoiding *svadhyaya* are related to the *audarik sharira*.
**21-28. Four Mahotsav and Four Mahapratipada:** The four *mahotsav* are Ashadh Purnima, Paush Purnima, Kartik Purnima, and Chaitra Purnima. The *pratipada* following these *purnimas* are called *mahapratipada*. *Svadhyaya* is prohibited during these days.
**29-32. Pratah, Sayam, Madhyahna, and Ardharatri:** One should not perform *svadhyaya* one *ghadi* before and one *ghadi* after sunrise, one *ghadi* before and one *ghadi* after sunset, one *ghadi* before and one *ghadi* after midday, and one *ghadi* before and one *ghadi* after midnight.