The World Almanac & Book of FactsNewspaper Enterprise Association, 1990 |
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第 1 到 3 筆結果,共 69 筆
第 223 頁
... earth caused by the combined gravitational attraction of the sun and moon . The combination of these two variable force in- fluences produces the complex recurrent cycle of the tides . Tides may occur in both oceans and seas , to a ...
... earth caused by the combined gravitational attraction of the sun and moon . The combination of these two variable force in- fluences produces the complex recurrent cycle of the tides . Tides may occur in both oceans and seas , to a ...
第 248 頁
... earth in a period whose mean or average duration is 27 days 7 hours 43.2 minutes . This is the moon's sidereal period . Because of the motion of the moon in common with the earth around the sun , the mean duration of the lu- nar month ...
... earth in a period whose mean or average duration is 27 days 7 hours 43.2 minutes . This is the moon's sidereal period . Because of the motion of the moon in common with the earth around the sun , the mean duration of the lu- nar month ...
第 250 頁
... Earth The geographic ( rotation ) poles , or points where the earth's axis of rotation cuts the surface , are not abso- lutely fixed in the body of the earth . The pole of rota- tion describes an irregular curve about its mean posi ...
... Earth The geographic ( rotation ) poles , or points where the earth's axis of rotation cuts the surface , are not abso- lutely fixed in the body of the earth . The pole of rota- tion describes an irregular curve about its mean posi ...
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