The equation of time, introduced by Ptolemy and later refined based on the work of Johannes Kepler, converts between apparent solar time and the mean time we've all come to rely on.
“均时差”概念，由托勒密发明后来由约翰尼斯·开普勒进行的改良，包含了太阳时间和平均时间的差距，是我们现在主要使用的时间概念。
Apparent solar time
原声例句
TED-Ed（视频版）
中文百科
太阳日 Solar time
（重定向自Apparent solar time）
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太阳日（英语：solar day）是依据太阳运动，所定义的时间，可以分为视太阳日和平太阳日。
一太阳日传统称为一“日”、一“天”或一“昼夜”。
英语百科
Solar time 太阳日
（重定向自Apparent solar time）
Solar time is a reckoning of the passage of time based on the Sun's position in the sky. The fundamental unit of solar time is the day. Two types of solar time are apparent solar time (sundial time) and mean solar time (clock time).
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