a piece of research, a study, investigation

to research, to study

cow, ox, cattle

cow, bull, ox, cattle, a domestic bovine / beef

polite form of ござる (gozaru) [godan], the humble form of the copula, ある (aru) / (humble, formal) to exist, to be, to have

astronomer

to tame; to domesticate

Alternative spelling of 飼い馴らす

shepherd

astronomical (relating to astronomy) / astronomical (vast)