Radiational component
As opposed to gravitational components, these are components derived from the sun's radiational action.
RAM
Références altimétriques maritimes (hydrographic datums)
Range of tide
Difference in height between successive low and high waters.
Reduced heights
Periodic magnitudes, resulting from an interpolation of heights observed for calculating reduced vectors.
Reduced vectors
Complex numbers representing the component elements of a species (modulus and phase) at a given moment).
REFMAR
Réseaux de référence des observations marégraphiques (Tide gauge observation reference networks).
Response method
Tidal analysis and prediction technique based on admittances.
Right ascension
Angle between the meridian plane of the celestial body and the vernal point, measured anti-clockwise towards the celestial body.
Rising tide
Time interval between a low water and the next high water. Synonym: rising tide, rise, flood.
RONIM
Réseaux d'observation du niveau de la mer (SHOM) (SHOM's sea level observation network).
ROSAME
Réseau d'Observation Subantarctique et Antarctique du niveau de la MER (LEGOS) (Sub-Antarctic and Antarctic sea level observation network).
Rule of sixths:
Expeditive method for calculating the current knowing its amplitude and the time of the maximum.