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“自然之门”是南澳北回归线标志塔,位于汕头市南澳岛上的北回归线广场,是唯一一座位于海岛上的北回归线标志塔。每年夏至正午,当太阳直射北回归线时,日影将穿过“自然之门”上方圆球中心圆管,投射地台中央,达到“立杆不见影”的效果。十字小溪-Y
0
The Gate of Nature is located in Qing'ao Bay at the eastern end of Nan'ao Island. It is the 11th Tropic of Cancer symbol tower built in my country so far. This is the unique scenery of my country on the Tropic of Cancer, and will surely play an important role in the research of world astronomy and geography. When the sun hits the Tropic of Cancer directly, the shadow of the sun will pass through the central tube of the upper sphere and project the center of the platform, which is one of the new attractions in South Australia. The construction of the Tropic of Cancer sign in Qing'ao Bay has added a new member to the Tropic of Cancer sign family, and it is also another measure for mankind to have a deeper understanding of the Tropic of Cancer and the earth.