This book contains three astronomical works, of which the first in order, "The Reference" by Hypsicles, and the third, "On Everything" by Achilleus Tatios, may represent parts of broader works.

The second, "On the Phenomena of Aratus" by Eratosthenes, according to some researchers, is not genuinely by Eratosthenes. However, various recent linguistic-statistical studies classify it among the genuine works.

[...] (from the introduction, Evangelos Spandagos)