CORIOLIS value of coriolis parameter f returns value of coriolis parameter f f = coriolis(lat) where lat is the latitude in DEGREES. By default the length of a day is 23 hr 56 m 4.1 s (a siderral day). A solar day the day has a length of 24 h precise. This can be switched on with an additional keyword,value pair: coriolis(latitude,'day',value) where value can be 'SIDERIAL','SOLAR','D3D','delft3d' or any value in SECONDS (all case insensitive). See also: beaufort, http://en.wikipedia.org/wiki/Coriolis_parameter