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Masha'allah ibn Atharī (c.740–815 CE) was an eighth-century Persian Jewish astrologer and astronomer from the city of Basra (located in Iraq) who became the leading astrologer of the late 8th century. According to Ibn al-Nadim in his Fihrist, Mashallah was "a man of distinction and during his period the leading person for the science of judgments of the stars". The Arabic phrase ma sha`a allah indicates acceptance of what God has ordained in terms of good or ill fortune that may befall a believer. Ibn al-Nadim said Mashallah's name was Mīshā, meaning Yithro (Jethro). Latin translators also called him Messahala (with many variants, such as Messahalla, Messala, Macellama, Macelarma, Messahalah). The crater Messala on the Moon is named after him. Science historian Donald Hill writes that Mashallah was originally from Khorasan.

Life and works
As a young man he participated in the founding of Baghdad for Caliph Al-Mansur in 762 by working with a group of astrologers led by Naubakht the Persian to pick an electional horoscope for the founding of the city. He wrote over twenty works on predominantly astrology, which became authoritative in later centuries at first in the Middle East, and then in the West when horoscopic astrology was transmitted back to Europe beginning in the 12th century. His writings include both what would be would be recognized as traditional horary astrology and an earlier type of astrology which casts consultation charts to divine the client's intention. It is also known that his work was heavily influenced by Hermes Trismegistus and Dorotheus. Only one of his writings is still extant in its original Arabic, but there are many medieval Latin, Byzantine Greek and Hebrew translations. His treatise De mercibus (On Prices) is the oldest extant scientific work in Arabic.

One of his most popular works in the Middle Ages was a cosmological treatise which provides a comprehensive account of the whole cosmos along Aristotelian lines. In it Mashallah covers many topics that were important in early cosmology and strays away from traditional cosmology by postulating a ten-orb universe. Mashallah had intended for his account to be aimed at laymen and therefore included diagrams with text to facilitate comprehension of his main ideas. The treatise was printed in two manuscript versions: a short version of 27 chapters known as De scientia motus orbis and an expanded version of 40 chapters known as De elementis et orbibus. The shorter version was translated by translated by Gherardo Cremonese (Gerard of Cremona). Both were printed in Nuremberg and in 1504 and 1549, respectively. This work is commonly referred to as De orbe for short.

Mashallah wrote the first treatise on the astrolabe (p 10) in Arabic. It was later translated into Latin as De Astrolabii Compositione et Ultilitate and included in Gregor Reisch's Margarita phylosophica (ed. pr., Freiburg, 1503; Suter says the text is included in the Basel edition of 1583). Its contents primarily deal with the construction and usage of an astrolabe.

His On Conjuctions, Religions, and People discusses the astrology of important world events and the role Jupiter-Saturn conjunctions have in their timing. This treatise does not survive intact and is preserved only in quotations by the Christian astrologer Ibn Hibinta. Other notable works are his Liber Messahallaede revoltione liber annorum mundi, a work on revolutions, and De rebus eclipsium et de conjunctionibus planetarum in revolutionibus annorm mundi, a work on eclipses. His work on nativities, with the Arabic title Kitab al - Mawalid, has been partially translated into English from a Latin transaltion of the Arabic by James H. Holden. Other astronomical and astrological writings are quoted by Suter and Steinschneider. An Irish astronomical tract also exists based in part on a medieval Latin version. Edited with preface, translation, and glossary, by Afaula Power (Irish Texts Society, vol. 14, 194 p., 1914). The notable 12th century scholar and astrologer Abraham ibn Ezra translated two of Mashallah's astrological treatises into Hebrew: She'elot and Ḳadrut (Steinschneider, "Hebr. Uebers." pp. 600–603). Eleven of Mashallah's astrological treatises were translated out of Latin into English in 2008 and are available in The Works of Sahl and Masha'allah by Benjamin N. Dykes. On Reception, is also available in an English translation by Robert Hand from the Latin edition by Joachim Heller of Nuremberg in 1549.

Philosophy
Mashallah postulated a ten-orb universe rather than the eight-orb model offered by Aristotle and the nine-orb model that was popular in his time. In all Mashallah's planetary model ascibres the universe 26 orbs, which account for the relative positioning and motion of the seven planets. Of the ten orbs, the first seven contain the planets and the eighth contain the fixed stars. The ninth and tenth orbs were named by Mashallah the "Orb of Signs" and the "Great Orb", respectively. Both of these orbs are starless and move with the diurnal motion, but the tenth orb moves in the plane of the celestial equator while the ninth orb moves around poles that are inclined 24° with respect to the poles of the tenth orb. The ninth is also divided into twelve parts which are named after the zodiacal constellations that can be seen beneath them in the eighth orb. The eight and ninth orbs move around the same poles, but with different motion. The ninth orb moves with daily motion, so that the 12 signs are static with respect to the equinoxes, the eighth Orb of the Fixed Stars moves 1° in 100 years, so that the 12 zodiacal constellations are mobile with respect to the equinoxes. The eight and ninth orbs moving around the same poles also guarantees that the 12 stationary signs and the 12 mobile zodiacal constellations overlap. By describing the universe in such a manner, Mashallah was attempting to demonstrate the natural reality of the 12 signs by stressing that the stars are located with respect to the signs and that fundamental natural phenomena, such as the beginning of the seasons, changes of weather, and the passage of the months, take place in the sublunar domain when the sun enters the signs of the ninth orb.