赤道係地球表面嘅點隨住地球自轉產生嘅軌跡中,周長最長嘅圓周線,長40,075.02公里。如果將地球睇做一個絕對嘅球體嘅話,赤道距離南北兩極相等。佢將地球分為南北兩半球,佢嘅北就係北半球,而南就係南半球,係劃分緯度嘅基線,赤道嘅緯度為0°。
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