Tropic of Cancer (0.468″) of latitude, or 15 metres, per year (it was at exactly 23° 27′N in 1917 and will be at 23° 26'N in 2045). See axial tilt and circles of latitude for further information. North of the tropic are the subtropics and the North Temperate Zone. The equivalent line of latitude south of the Equator is called the Tropic of Capricorn, and the region between the two, centered on the Equator, is the tropics. There are approximately 13 hours, 35 minutes of daylight during the summer solstice. During the winter solstice, there are 10 hours, 41 minutes of daylight. Starting
Capricorn and Bunker Group Cay stability is profoundly affected by cyclonic disturbance. The coral cays belong to two distinct types: The sand cays are all located to the lee of their reef flat, whereas the shingle cays, with the exception of Lady Musgrave, are located on the windward side. They vary in size, covering from one to 12 percent of the reef top surface area and there does not appear to be any correlation between island size, reef size, or stage of reef development. The Capricorn and Bunker Group contains 73–75 percent of all seabird biomass in the Great Barrier Reef World Heritage Area.