خورشید = the Sun when talking about sun light or sun propety , we say "آفتاب" for example: sky is sunny = آسمان آفتابی است sunbathing = آفتاب گرفتن نمیگوییم "خورشید گرفتن" یا " آسمان خورشیدی است"

آفتاب (noun) 1. The Sun 2. light arrays of the Sun خورشید (noun) The Sun آفتابی (adj.) sunny خورشیدی (adj.) solar

hi dear. The term "آفتاب" semantically refers to the processes and procedures relevant to the physical sun (خورشید). for example as the friends explained, we cannot say the weather is sunny in Persian as: هوا خورشیدی است, since the term خورشید only refers to the physical body in the sky. hope it was helpful.

"Âftab (آفتاب)" is usually used for "sunlight", and "khorshid (خورشید)" for "the Sun".