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<timefyi-glossary slug="equation-of-time"></timefyi-glossary>Định nghĩa
Su khac biet giua gio mat troi bieu kien va gio mat troi trung binh, do quy dao hinh elip va do nghieng truc cua Trai dat. Dao dong tu khoang -14 den +16 phut trong suot nam.