草稿五

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地方时和区时的计算公式?

1、求时区:
时区数=已知经度/15°(商四舍五入取整数,即为时区数)
2、求区时:
所求区时=已知区时±时区差(东加西减)
3、求地方时:所求地方时=已知地方时±4分钟/度 x 经度差(东加西减)
1.地方时
①概念:因经度而分歧的时刻
②成因:地球自西向东自转,使同纬度偏东地点时刻早.经度每隔15°,地方时相差1小时.
③计算公式:
所求地方时=已知地方时+(经度差)x4分钟
(所求地在东,"±"号取"+"号,反之取"号)

①时区:实际上全球划分成24个时区,每隔经度15°划为一个时区.
②区时◇各时区同一使用本时区中央经线的地方时作为全区共同使用的时间就叫区时.时刻为东早西晚.相邻两时区的区时相差1小时.
③计算公式:
所求区时=已知区时+时区差(东加西减)

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