It gave mean solar time, mean sidereal time, equation of time, and could chart the phases of the moon.
表盘上不仅能显示平太阳时，还能显示平恒星时、时差，记录月相。
Equation of time
原声例句
经济学人-综合
TED-Ed（视频版）
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。
中文百科
均时差
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均时差是在一年之中，来自日晷和钟表的时间差异。日晷可以比钟表的时间快〈超前〉16分33秒〈大约在11月3日〉或慢〈落后〉14分6秒〈大约在2月12日〉。这起因于地球的轨道倾角〈自转轴对公转轨道平面的倾斜〉，与轨道离心率造成太阳明显的不规则运动。均时差可以说明视觉上的太阳8字体曲线〈Analemma〉。
自然的，其他的行星也有均时差。在火星，因为离心率更大，日晷和钟表显示的时间会差异到50分钟。
英语百科
Equation of time 均时差
The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of reconcile a difference. The two times that differ are the apparent solar time, which directly tracks the motion of the sun, and mean solar time, which tracks a theoretical "mean" sun with noons 24 hours apart. Apparent (or true) solar time can be obtained by measurement of the current position (hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. Mean solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would resolve to zero.
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