Earth, sun, moon: three objects in space whose interactions have a pretty big impact on our lives. Earth orbits the sun once a year, and it rotates on its axis about once a day (depending on your definition of “rotate”). This gives us the night-day sequence and the yearly cycle of the seasons.
The moon’s gravitational tug influences the tides. On a monthly cycle, we can also see the phases of the moon, which are caused by the relative positions of these three orbs. A full moon makes it possible to see at night. Before electric lights, this was a big deal.
You can see how these interactions structure our whole