Strabo Geography 1.1.15

[15] He who has thus elevated his mind, will he be satisfied with any thing less than the whole world? If in his anxiety accurately to portray the inhabited earth, he has dared to survey heaven, and make use thereof for purposes of instruction, would it not seem childish were he to refrain from examining the whole earth, of which the inhabited is but a part, its size, its features, and its position in the universe; whether other portions are inhabited besides those on which we dwell, and if so, their amount? What is the extent of the regions not peopled? what their peculiarities, and the cause of their remaining as they are? Thus it appears that the knowledge of geography is connected with meteorology ¹ and geometry, that it unites the things of earth to the things of heaven, as though they were nearly allied, and not separated.

As far as heaven from earth. ²

Iliad viii. 16