Half tide
Means of high and low waters.
Harmonic analysis
Calculation of the harmonic constants of the tide.
Harmonic component
Elementary tide wave, defined by its frequency, amplitude and phase.
Harmonic constant
The amplitude and situation of a harmonic component are harmonic constants of the said component.
HCR/DDPC-PF
Haut commissariat de la République de Polynésie française / Direction de la Défense et de la Protection Civile - Polynésie française (High commission of the Republic in French Polynesia / Directorate of defence and civil protection – French Polynesia)
HCR/DSC-NC
Haut commissariat de la République en Nouvelle-Calédonie / Direction de la Sécurité Civile - Nouvelle-Calédonie (High commission of the Republic in New Caledonia / Directorate of civil safety – New Caledonia)
High and low waters
Extremes of the tide curve.
Hour angle
Angle between the meridian half-plane of the position and the meridian half-plane of the celestial body, measured clockwise in the direction of the heavenly body.