sun
The Italian word 'sole' refers to the star at the center of the solar system that the Earth revolves around. It can be used in many contexts, such as weather ('il sole splende' - the sun shines), time of day ('al sorgere del sole' - at sunrise), or simply to refer to the object in space ('il sole è una stella' - the sun is a star).
The sun shines bright today.
This sentence describes a common occurrence of the sun shining brightly, normally used when describing a clear and sunny weather.
I like watching the sunset.
This sentence expresses the speaker's enjoyment of watching the sunset. 'Il tramonto del sole' directly translates to the 'sunset of the sun'.
Without the sun, there would be no life.
This sentence emphasizes the importance of the sun for life. It states a common scientific fact that the sun is crucial for all life on earth.