Meaning: The first day of the week had bright sunlight.
Choice of Words: Sunday is the seventh day of the week. Sunny means full of sunshine or bright sunlight.
Alternative Expressions
It was a sunny Sunday.
Meaning: This sentence emphasizes the weather condition on a particular Sunday, highlighting that it was sunny.
Choice of Words: The phrase "It was" implies the existence of something. "A" is an indefinite article that refers to one instance of something. "Sunny" describes the weather condition. "Sunday" refers to the day of the week.
On Sunday, the sun was shining.
Meaning: This sentence provides a more detailed description of the weather condition on a particular Sunday, stating that the sun was emitting light and warmth.
Choice of Words: The phrase "On Sunday" indicates a specific day of the week. "The sun" refers to the celestial body that provides light and heat to Earth. "Was shining" describes the action of emitting light and warmth.