Which literary device is used in this sentence? the east edge of the earth was easily seen.

Alliteration is used because most of the words in the sentence have the same beginning letter, which in this case, is e. But, if that is not one of your choices, then it shall be assonance because of how the repetition of the vowel is occurring in the sentence as well. Hope this helps!

The answer is Assonance

A linear measure, especially for land.