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南澳北回归线标志塔“自然之门”,位于汕头市南澳县青澳湾的北回归线广场,据说每年夏至正午,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,人景相映,趣味横生。
8
The Gate of Nature is located in Qing'ao Bay on the eastern end of Nan'ao Island. It is the 11th Tropic of Cancer Tower built by China. It plays an important role in the study of the world astronomy and geography. When the sun shines directly on the Tropic of Cancer, the shadow will pass through the center of the upper ball and project into the center of the platform, which is one of the new attractions in South Australia. The construction of the logo of the Tropic of Cancer in the Tseung Kwan O Bay has added a new member to the Tropic of Cancer logo family. It is also another measure for human beings to better understand the Tropic of Cancer and to understand the Earth.