A solar day is the time it takes for the Earth to orbit around the Sun.

He was reading a book about the ancient Egyptian sun god.

The ocean currents can change due to the effect of the solar tide.

We installed solar batteries on the roof of our house.

The Solar System is composed of eight planets, including Earth.

Solar wind affects the Earth's magnetic field.

This room feels bright because it has enough luminous flux.

Mitsuko is my best friend.

Migihiro is my best friend.

In urban areas, light pollution makes it difficult to see the starry sky.