Tidal prediction

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See instead: Ocean and shelf tides

Table 1: Dominant tidal harmonics
Name Symbol Period
Semidiurnal components
Main lunar M2 12.42 hours
Main solar S2 12.00 hours
Lunar elliptic N2 12.66 hours
Lunisolar K2 11.97 hours
Diurnal components
Lunisolar K1 23.93 hours
Main lunar O1 25.82 hours
Solar P1 24.07 hours
Longer components
Lunar fortnightly Mf 13.66 days
Lunisolar fortnightly Msf 14.77 days
Lunar monthly Mm 27.56 days
Solar semiannual SSa 182.62 days
Solar annual Sa 365.25 days