Simplify the following text for a Grade 8 native English-speaking person.
Original: For planets with an orientation and rotation similar to the Earth 's , the subsolar point will move westward , circling the globe once a day , but it will also move north and south between the tropics over the course of a year .
Simplified: For planets with a rotation like the Earth 's , the subsolar point will move westward , circling the globe once a day .