(from the article `Earth tide`) ...tidal components mathematically can be shown to exist, but only four are large enough to be generally measurable; these are the lunar diurnal, the ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/s/62
A tide having two high waters and two low waters each lunar day , with little or no diurnal inequality . This applies equally to solar tides and to atmospheric tides .
Found on
http://www.encyclo.co.uk/local/20124
Tides occurring twice daily. There are two high and two lows per tidal day. See Figure12.
Found on
https://www.encyclo.co.uk/local/20127
No exact match found.
