Greek astronomer Dimitrios Psaltis was instrumental in the gigantic effort to take mankind's first-ever image of a black hole ...

Seleucus of Seleucia was an ancient astronomer who defended heliocentrism, arguing that Earth orbits the Sun and rotates on ...

Halaku, in pursuit of better political fortunes, saw fit to fund an establishment that could meticulously keep track of the ...

Claudius Ptolemy was a Greek mathematician, astronomer and geographer who lived in the Egyptian city of Alexandria while under the rule of the Roman Empire. Much of medieval astronomy and ...