“Under the sun” is a phrase used quite often in Ecclesiastes.
This fleeting life of vanity we live here on earth is under the sun. A grasping for the wind.
Be encouraged: There will come a time when we live in a kingdom that has no need for a sun because the glory of God will illuminate it and the Lamb will be the light! God’s dwelling place will be with His people, He will walk among us, and we will see His face!
So while we are here, under the sun, let us live as residents of the kingdom to come.