. The geography of New Zealand. Historical, physical, political, and commercial . ort Pegasus areperfect harbours for large or small craft. SouthCape, East Head, and Black Point are prominentcapes. The numerous outlying islands are small androcky. Tides. The attraction exercised by the moon on the earthcauses the ocean to bulge out towards it. As theearth rotates and the moon appears to move fromeast to west, the bulge in the ocean subsides. Thusis generated a tidal wave, which has a period ofabout 121/2 hours. The movement of these tidalwaves causes the ocean margin to rise and fall atevery s
. The geography of New Zealand. Historical, physical, political, and commercial . ort Pegasus areperfect harbours for large or small craft. SouthCape, East Head, and Black Point are prominentcapes. The numerous outlying islands are small androcky. Tides. The attraction exercised by the moon on the earthcauses the ocean to bulge out towards it. As theearth rotates and the moon appears to move fromeast to west, the bulge in the ocean subsides. Thusis generated a tidal wave, which has a period ofabout 121/2 hours. The movement of these tidalwaves causes the ocean margin to rise and fall atevery spot on the shore twice in twenty-five hours. The sun has a similar attractive action and sohave all other celestial bodies, though their effect isless marked, because they are much further awaythan the moon, and further away or immenselysmaller than the sun. When the sun and moon arein the same (new moon) or in exactly oppositedirections (full moon) in the sky, the waves theygenerate become coincident, and the resultant tidal THE NEW ZEALAND COAST 87 l(ci>madecs ^—--^ i^i. / / Chafhom Is. /fit fS Boun^Y Is- ?4Anfipodes ^Auckland Cotidal Lines /Tidal Cuppents —>• • I? . ., . i (Flood Tide) ,? Campbell b. Ocean Currents > Tidal Map or 88 GEOGRAPHY OP NEW ZEALAND wave reaches its greatest height. These are springtides. When the moon is halfway between thepositions alongside and opposite the sun, the wavesthey generate interfere with one another, and thelowest or neap tides result. Where this low heaving wave meets any landmass, it wells round its coast, and its direction andheight undergo great change. Currents of somepower and velocity are generated especially roundprojecting points of the land or through straits thatseparate two land masses from each another. InNew Zealand, for instance, the tidal stream thatflows round East Cape has a velocity of 3 knots perhour, while in Foveaux Strait, and Cook Strait itreaches at times 5 knots, and in the French Pas
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