Patterns in Motion
• All planets orbit in almost the same plane
(ecliptic, AKA Zodiac)
• Almost all motion is counterclockwise as seen
from the north:
– All planets orbit in this direction
– *Almost* all planets spin in same direction
• with axes more-or-less perpendicular to ecliptic
– Regular moons (like Galilean satellites and our
own moon) orbit in this direction too
• Planets are regularly spaced
– steps increasing as we go outward