Tidal prediction

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