A typical tide record

From George H. Darwin's article "Tides" in the 9th edition of the Encyclopaedia Britannica. Note that in this graph, time increases to the left.

• there are usually two high tides and two low tides each day;
  
• the tides come about 50 minutes later each day;
  
• during the two-week period there is considerable variation in the daily pattern of highs and lows;
  
• there is usually a difference in height between two consecutive high tides (the diurnal inequality).

• Ocean tides

• Tides and gravitation

• The geometry of the solar tide

• The trigonometry of the solar tide

• The lunar tide

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