[Q]jyoti.h'saastra - what is "catarchic"?

[Gary Tubb]

"Catarchic" means "connected with (determining the proper time for)
beginning an action."  "Catarchic Astrology" (referring to what in
Sanskrit is called "muhuurta") is the title and topic of Chapter 6 in
David Pingree's _Jyotihsastra: Astral and Mathematical Literature_,
which is Volume 6, Fascicle 4 in Gonda's _History of Indian Literature_
(Wiesbaden 1981).