Watch the sun go dark in the middle of the day What is a solar eclipse, and what's special about the one that's occurring today?
太陽不見了
了解日蝕成因，以及今天這場日蝕的特別之處
by Ryan Batdorf
Ready or not, a total solar eclipse will occur today where people in Asia can see it.
What causes a solar eclipse? A solar eclipse occurs when the moon passes between the earth and the sun. This always happens during a new moon, but the angle of the moon’s orbit keeps an eclipse from occurring every month. About twice a year, the earth and moon’s orbits line up so that the moon’s shadow falls somewhere on the earth’s surface. That is when a solar eclipse occurs.
