the southeast asian tradition also uses the hindu names of the days of the week. hindu astrology adopted the concept of days under the regency of a planet under the term "vāra", the days of the week being called "āditya-, soma-, maṅgala-, budha-, guru-, śukra-," and "śani-vāra". "śukrá" is a name of venus (regarded as a son of bhṛgu); "guru" is here a title of bṛhaspati, and hence of jupiter; "budha" "mercury" is regarded as a son of "soma", i.e. the moon.