Xich vi (Mat Troi)
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<timefyi-glossary slug="declination"></timefyi-glossary>Định nghĩa
Khoang cach goc cua Mat Troi phia bac hoac nam tinh tu xich dao tren troi, dao dong giua khoang +/-23.5 do trong mot nam do do nghieng truc cua Trai dat. Xich vi xac dinh do dai cua ngay va chieu cao cua Mat Troi tren bau troi.