فَإِذَا حَلَّتِ الصَّلَاةُ بِارْتِفَاعِ الشَّمْسِ: دَخَلَ وَقْتُهَا إِلَى الزَّوَالِ، فَإِذَا زَالَتِ الشَّمْسُ: خَرَجَ وَقْتُهَا.
Translation: The time begins after the sun has risen sufficiently and continues until the sun reaches the meridian; thereafter the time has ended.
The initial prohibited interval after sunrise must first pass. The Eid prayer is performed before the meridian; its permissible timing depends on the actual solar position, not a universal clock time.