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tide table
Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and heights of high water and low water, usually for a particular location. Tide heights at intermediate times (between high and low water) can be approximately calculated using the rule of twelfths or more accurately by using a published tidal curve for the location.
==Publication and Scope==
Tide tables are published in various forms, such as paper-based tables and tables available on the Internet. Most tide tables are calculated and published only for major ports, called "standard ports", and only for one year — standard ports can be relatively close together or distant hundreds of kilometers. The tide times for a minor port are estimated by the tide-table user manually calculating using the published time and height differences between a "standard" port and the minor port.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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