Analemma
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<timefyi-glossary slug="analemma"></timefyi-glossary>Định nghĩa
Duong cong hinh so 8 duoc vet boi vi tri cua Mat Troi tren bau troi khi quan sat cung mot luc moi ngay trong mot nam. No la ket qua cua su nghieng truc va do lech tam quy dao cua Trai dat.