The Observations
The sun makes a round trip of the sky every day
The sun moves through the entire zodiac in 1 year
The moon goes through phases over the course of a month
The moon can come between us and the sun.
The planets (in order of speed)
- Mercury, only seen near sunrise and sunset
- Venus, also a morning or evening star
- Mars, Jupiter and Saturn travel the enitre zodiac
Mars, Jupiter and Saturn reverse their direction for a while when they are opposite the sun (retrograde motion). The planets vary in brightness depending upon position