prá-aa-títsun (respectful)
พระ- is an honorific prefix, here showing reverence for the sun. แดด is only its light.
TonesพรClasslowSyllablesthree
Made of
literally “sacred sun”
อาทิตย์ on its own means “week (casual); sun”.
How it reads
พระอาทิตย์
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Letters in the word
Kai says
A Thai final k, t or p stops the sound without a strong release. Don't add an extra vowel after it just to make the ending easier to say.