Washington Irving's 1828 biography of Columbus popularized the idea that Columbus had difficulty obtaining support for his plan because Christian theologians insisted that the Earth was flat.[23] In fact, most educated Westerners had understood that the Earth was spherical at least since the time of Aristotle, who lived in the 4th century BC and whose works were widely studied and revered in Medieval Europe.[24] The sphericity of the Earth is also accounted for in the work of Ptolemy, on which ancient astronomy was largely based. Christian writers whose works clearly reflect the conviction that the Earth is spherical include Saint Bede the Venerable in his Reckoning of Time, written around AD 723. In Columbus's time, the techniques of celestial navigation, which use the position of the Sun and the Stars in the sky, together with the understanding that the Earth is a sphere, were beginning to be widely used by mariners.
markedsføring
virginia window treatments va