In this regard, Madhvācārya quotes the following verses from the Brahmāṇḍa Purāṇa:
yathā bhāgavate tūktaṁ
maṇḍode puraṇaṁ caiva
vinaiva sarvam unneyaṁ
yojanābhedato ’tra tu
It appears from these verses that aside from the sun and moon, there is an invisible planet called Rāhu. The movements of Rāhu cause both solar and lunar eclipses. We suggest that the modern expeditions attempting to reach the moon are mistakenly going to Rāhu.