The use of the word planet here does not correspond to its astronomical term. Rather it is used in it's ancient way, meaning any object that moves across the sky at a rate diffrent from the fixed stars.
“Venus is the warmest planet in our solar system. It's name comes from that of the Roman goddess...Venus
“The closest planet to the sun, Mercury is one of the five celestial bodies known in ancient...Mercury
“Saturn is the furthest planet known in ancient times. The day Saturday is named after the Roman...Saturn
“Jupiter is the largest planet in our solar system, associated with good fortune, luck, and...Jupiter