Before or after sun rise, a person of controlled senses, with heart filled with devotion poured libations on the (sacrificial) fire according to the Vedic prescription. Devotion is a powerful agent.
उदितेऽनुदिते वापि श्रद्दधानो जितेन्द्रियः। वहिं जुहोति धर्मेण श्रद्धा वै कारणं महत्॥