Illustration of the Ptolemaic geocentric model of the Universe (the theory that the Earth is the center of the universe) by Portuguese cosmographer and cartographer Bartolomeu Velho. Taken from his treatise Cosmographia, made in Paris, 1568. Notice the distances of the bodies to the centre of the Earth (left) and the times of revolution, in years (right).Photo credit: Joaquim Alves Gaspar
 | This picture of the day has been featured on Portal:Geography. |
 | This picture of the day has been featured on Portal:Solar System. |