Ptolemy's authority was preferred by most Astronomy in medieval Islam and late medieval European astronomers.

Ptolemy's authority was preferred by most medieval Islamic and late medieval European astronomers.

The late Babylonian astronomers of the fourth and later centuries BC studied the motions of the sun and planets with great care and mathematical ingenuity, but their most detailed investigations were of the moon because the calendar was moon-based.

It is one of the Bok globules, named after Dr. Bart J. Bok, the late Dutch-American astronomer who in 1947 was one of the first to point out their potential role as star-formation sites.

He also enjoys the works of the late astronomer and science lecturer Carl Sagan, whom he calls "a genius".

The late astronomer's reflections on the future, human relationships, God and other topics.

The strong evidence afforded by the history of mythology, and geological researches, that some event of this nature has taken place already, affords a strong presumption that this progress is not merely an oscillation, as has been surmised by some late astronomers.

Carl Sagan, the late astronomer, in his 1994 book, "Pale Blue Dot" (Random House), asked gingerly if the Earthly tree of life could have arisen from Martian seeds, if the two planets "regularly exchanged life-forms" over the ages.

Edmond Halley, the late British astronomer who calculated the orbit of Halley's Comet, has been celebrated with a Google Doodle marking his 335th birthday.

According to Asger Aaboe, the origins of Western astronomy can be found in Mesopotamia, and all Western efforts in the exact sciences are descendants in direct line from the work of the late Babylonian astronomers.