One of Anania's most significant works is Cosmology (Տիեզերագիտութիւն, Tiezeragitut’iun).
Abrahamian's version is composed of ten chapters, with an introduction titled "In the Fulfillment of a Promise", implying a patron.
It covers the sun, the moon, celestial spheres, constellations, the Milky Way, and meteorological changes.

Works used for the parts of the Cosmology include the Bible (mostly the Pentateuch and Psalms) and works by the Church Fathers.
Anania cites the work of Basil of Caesarea, Gregory the Illuminator, and Amphiolocus (perhaps, of Iconium).
Some chapters of the work, such as "On Clouds" (also called "On the Sky" or "Concerning the Skies"), are largely based on Basil's Hexameron.
Anania also repeats the classical Greek notions in the fields of astronomy, physics or meteorology.
Pambakian wrote about the significance of the Cosmology: 
In conclusion, when viewed as a Byzantine text, the Cosmology's originality may be sought in the way in which pagan and Christian traditions are combined (and often intrinsically intertwined), and much may be learned about the ‘making of science’ in the context of the seventh-century.
Within the specific context of Armenian literature, this text deals with many aspects of natural philosophy in unprecedented depth.

Another of Anania's astronomical works, Tables of the Motions of the Moon (Խորանք ընթացիք լուսոյ, xorank‘ ĕnt'ac'ik' lusoy), is based on the works of Meton of Athens and his own observations.
One of Anania's most significant works is Cosmology (Տիեզերագիտութիւն, Tiezeragitut’iun). Abrahamian's version is composed of ten chapters, with an introduction titled "In the Fulfillment of a Promise", implying a patron. It covers the sun, the moon, celestial spheres, constellations, the Milky Way, and meteorological changes.
Works used for the parts of the Cosmology include the Bible (mostly the Pentateuch and Psalms) and works by the Church Fathers. Anania cites the work of Basil of Caesarea, Gregory the Illuminator, and Amphiolocus (perhaps, of Iconium). Some chapters of the work, such as "On Clouds" (also called "On the Sky" or "Concerning the Skies"), are largely based on Basil's Hexameron. Anania also repeats the classical Greek notions in the fields of astronomy, physics or meteorology. Pambakian wrote about the significance of the Cosmology: 
In conclusion, when viewed as a Byzantine text, the Cosmology's originality may be sought in the way in which pagan and Christian traditions are combined (and often intrinsically intertwined), and much may be learned about the ‘making of science’ in the context of the seventh-century. Within the specific context of Armenian literature, this text deals with many aspects of natural philosophy in unprecedented depth. 
Another of Anania's astronomical works, Tables of the Motions of the Moon (Խորանք ընթացիք լուսոյ, xorank‘ ĕnt'ac'ik' lusoy), is based on the works of Meton of Athens and his own observations.
Anania Shirakatsi