When were the inner planets discovered?
The inner planets have been known about since ancient times. Astronomers in Ancient Egypt, Greece and Persia all would have studied the skies and noticed the inner planets. The planets, of course, are completely different to stars, as stars are ‘fixed’ in the sky (as we look at them, anyway), while planets seem to meander around going nowhere in particular. The odd behaviour led astronomers to attribute this to godly doings…
