Synodic Period · Lapping
unseel.com · conjunction · opposition · 1/S = 1/P₁ − 1/P₂
Inner P₁ 1.0 yr
Outer P₂ 1.9 yr
Step
Inner planet (faster)
Outer planet (slower)
Alignment line
Synodic count
Unseel.com · Synodic Period