वायुर्भुवश्चाधिपतिस्तेन वायुर्भुवस्पतिः / दिवस्य सूर्यो ऽधिपतिस्तेन सूर्यो दिवस्पतिः
vāyurbhuvaścādhipatistena vāyurbhuvaspatiḥ / divasya sūryo 'dhipatistena sūryo divaspatiḥ
Vayu is the ruler of Bhuvarloka; therefore Vayu is called Bhuvaspati. Surya is the ruler of the heavenly realm; therefore Surya is called Divaspati.