Circumambulation

S 2:125 And when we made the House a resort for people and security. And take from the station of Ibrahim a musalla. And we covenanted to Ibrahim and Isma’il: Purify my house for the circumambulators and those devoted and those who bow, those doing sujud.

S 22:26 And when we nominated for Ibrahim the place of the house, Do not associate with me anything and purify my house for the circumambulators and the standers and the bowers and the sujud-doers.

S 22:29 Then let them complete their tafath and fulfill their vows and circumambulate the ancient house.

The Quran is 'clear' and 'detailed', so how exactly is one to circumambulate the house? And what house? How many times?