Tang sang dan su
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<timefyi-glossary slug="civil-twilight"></timefyi-glossary>Định nghĩa
Khoang thoi gian khi Mat Troi o khoang 0 den 6 do duoi duong chan troi. Co du anh sang tu nhien cho hau het cac hoat dong ngoai troi ma khong can den nhan tao.