不像在地球上，有日夜交替，有云遮雾绕，太空中的阳光几乎永恒不变——除了在春分秋分的那几天之外。

Unlike on earth, with its cycle of nights and days and where there can be clouds, sunshine in space is practically constant - aside from a few days around the spring and autumn equinoxes.

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根据罗马儒略历，春分、秋分以及四季每年提前11分钟出现，1500年后则提前至3月11日。

Using the Julian calendar, the spring and fall equinoxes and the seasons were arriving 11 minutes earlier each year. By 1500 the vernal equinox had fallen back to March 11.

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季节以夏至，冬至和春分、秋分这些与地球的倾斜相关的天文学术语标记。

The seasons are marked by solstices and equinoxes - astronomical terms that relate to Earth's tilt.

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