2月20日的Eclipse Countdown应用程序分析

Application for predicting upcoming solar and lunar eclipses. Provides real-time countdown to the second. It can handle solar eclipses (total, annular and partial) as far as lunar eclipses (partial, total or penumbral) A great app for people who like astronomy and want to stay up-to-date on upcoming eclipses. Solar eclipses occur when the Moon passes between the Sun and the Earth, casting a shadow on the Earth. Lunar eclipses occur when the Earth passes between the Sun and the Moon, casting a shadow on the Moon.