The sun is the first of all luminous bodies. Fire is said to be the first of all the elements, Savitri is the first of all branches of learning. Prajapati is the first of all the celestials.
आदित्यो ज्योतिषामादिरग्निर्भूतादिरुच्यते। सावित्री सर्वविद्यानां देवतानां प्रजापतिः॥