Srimad Bhagavatam Canto 11, Chapter 15, Text 20

SB 11.15.20

caksus tvastari samyojya
 tvastaram api caksusi
mam tatra manasa dhyayan
 visvam pasyati duratah
 
Translation: 
 
Merging one’s sight into the sun planet and then the sun planet into one’s eyes, one should meditate on Me as existing within the combination of sun and vision; thus one acquires the power to see any distant thing.
Srimad Bhagavatam Canto 11, Chapter 15, Text 19
Srimad Bhagavatam Canto 11, Chapter 15, Text 21