The sun shone brightly all day.

Meaning: This means that the sun was shining very brightly for the entire day.

Choice of Words: Sun is the star at the center of our solar system. Shone means that the sun was giving off light and heat. Brightly means that the sun was shining with great intensity. All day means from morning until evening. Put together, it means the sun was shining with great intensity for the entire day.