[Observation] Limited to movement near the sun [Modeling mechanism] Center their deferent centers along the Sun-Earth line. [Object(s)] 
Interior planets
S t a r s
S u n
M o o n
T h e 5 p l a n e t s
P l a n e t s
I n t e r i o r p l a n e t s
E x t e r i o r p l a n e t s