Hinako is my best friend.

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.

Please remember this old proverb, 'The friendship of a gentleman is insipid as water.'

This room feels bright because it has enough luminous flux.

Mitsuko is my best friend.