The Greek<span> achievements in </span>mathematics<span> and </span>astronomy were<span> one of the finest in antiquity. </span>Mathematics<span> developed first, aided by the influence of Egyptian </span>mathematics<span>; </span>astronomy<span>flourished later during the Hellenistic age, after Alexander the Great conquered the East, aided by the influence of Babylon.
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The war which occurred in the mid-1800s that weakened the economy of the Ottoman Empire was the Russo-Turkish War, led by the Turks on one side, and Russia, Bulgaria, Romania, Serbia, and Montenegro on the other.
