最早测量地球大小的是古希腊天文学家埃拉特色尼。
The first measurement of the size of the earth is the ancient Greek astronomers, Ella characteristics.
公元2世纪，古希腊天文学家托勒密综合了当时的天文成就，编制了48个星座。
In 2nd century AD, the Greek astronomer Ptolemy combined astronomical achievements at the time, compiled the 48 constellation.
星等分类的方法沿用了超过2000年，由古希腊天文学家Hipparchus于公元前125年创立。
The magnitude of a star is based on a scale more than 2,000 years old, devised by Greek astronomer Hipparchus in about 125 BC.
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