These events occur every few years, and are a natural result of the positions these objects appear in as they revolve around the sun (planets) and the earth (moon).
(These events; occur; T:every few years) (These events; are; a natural result of the positions) (these objects; appear; L:in; T:as they revolve around the sun) (they; revolve; around the sun)
These events These events these objects they
occur are appear revolve
T:every few years
a natural result of the positions
L:in T:as they revolve around the sun
around the sun