Among the Dead Sea Scrolls are books telling elaborate stories—based loosely on biblical narratives—about angels. Helen R. Jacobus examines a small number of these scrolls with a particular focus on mathematics (free registration required):
Angels are often associated with secret knowledge but not usually with authentic mathematics. In several of the Dead Sea Scrolls there is a complicated network of parallel stories in which angels impart secret knowledge of the calendar, astronomy, astrology, and divination to humans before the Flood. These secrets were important for Jews and early Christians, among other things, to know about current scientific knowledge around them that had been developed to an advanced level by their neighbors in the ancient Near East and Mediterranean.
The myths are expansions of Genesis 5:23–24, the after-life of [Adams’s descendant] Enoch whose days ended at 365 years, and Genesis 6:4, the appearance of nefilim—[rendered as] giants in the Septuagint—benign progeny of divine beings and the daughters of humans. In early Jewish writings these short passages have been woven into epic, “rewritten Bible” sagas.
Nothing in these manuscripts indicates they are part of mythological books. When reconstructed it can be seen that they contain real astronomical calendars, and actual mathematical material. But angels are at the forefront. . . . An understanding of astronomy and mathematics ensured that people prayed at the correct time with the angels, a theme in several of the Dead Sea Scrolls.
Read more on ASOR: http://asorblog.org/2015/04/14/zodiac-calendars-and-angelic-teaching-in-the-dead-sea-scrolls/