"To the ancient eye, without the use of spyglass, only seven of these ‘wanderers’ or ‘planets’ as they were known, could be seen among the thousands of lights that bejewelled the firmament. The 'Wanderers' were different. True, like the fixed stars, the Sun, Moon, Mercury, Venus, Mars, Jupiter, and Saturn all seemed to revolve once a day around the Earth. But the Plants also had a peculiar motion."