In fact, clock time and Sun time only match four times a year.

事实上，时钟的时间和太阳时间一年只会重合四次。

This means that on a star, like the sun, time beats even slower.

这意味着在像太阳这样的恒星上，时间跳动得更慢。

Angular momentum is equal to the mass of the planet times the distance of the planet to the Sun times the velocity of the planet.

角动量等于行星的质量乘以行星到太阳的距离乘以行星的速度。