Jewish Calendar in the Roman Period.
The Hebrew version was published in:
Annual Proceedings of the Conference on the History of Judea and Shomron,
vol. 11, Ariel 2002, pp. 275-286.
Mysteries of the Jewish Calendar.
A Unique Feature of the Jewish Calendar - Dekhiyot.
Culture & Cosmos, UK, 6 (1), 2002, pp. 3-22.
Talmudic Puzzle and the Jewish Calendar in the Late 3rd Century.
(With Brendan McKay. 2003, unpublished)
Astronomy of Maimonides and its Arabic Sources.
The Rising of Canopus, the Septuagint and the Encounter Between Shimon ha-Zadik and Antiochus the Great.
Judaica, Tubingen University, 61 (1), March 2005, pp. 42-54 (in German)
'Shana Meuberet' and the 'Theory of Others'.
'Mashallah Ibn Athari'.
(BEA - Biographical Encyclopedia of Astronomers, SPRINGER 2008)