Guiping Tropic of Cancer Sign Park

　　The Tropic of Cancer Sign Park is located beside the Nanwu Second-Class Highway in Xiaowen Village, Shizui Town, about 5 kilometers east of Guiping City, Guangxi. It is named for being situated on the Tropic of Cancer, and it is home to the first Tropic of Cancer monument in Guangxi. The main construction began on November 1, 1996, and was completed on June 21, 1997.

　　The Tropic of Cancer marker is located at 110°08'36" east longitude and 23°26'17" north latitude. The site covers an area of 2,462 square meters. The tower stands 17.2 meters tall and spans 26 meters, symbolizing the Tropic line. A beautiful arc-shaped column resembling a rainbow passes through a sphere representing the Earth, which has a diameter of 6 meters. There is a 10-centimeter "sun-viewing hole" in the center of the sphere.

　　Looking through the sun-viewing hole at the blazing sun allows one to truly appreciate the natural mystery of the Earth tilting as it rotates through the zodiac, while the sun's direct rays shift between the Tropic of Cancer and the Tropic of Capricorn. Sunlight shines directly through this hole onto the point marking “Guiping” on a map of the Guangxi Zhuang Autonomous Region located directly beneath. The east-west sides of the marker feature a 5-centimeter-wide, over 20-meter-long Tropic of Cancer indication line, which also marks the boundary between the tropics and the temperate zone. Standing here, you can have one foot in the tropics and the other in the temperate zone. When speaking at the central Guiping point on the marker, your voice becomes particularly loud, as if using a microphone. Moreover, whispering 32 meters apart between the northern and southern points here is as clear as talking on the phone. As you move outward along the east-west chord line, the loud, resonant sound gradually weakens—an effect that is extremely interesting. This is the only one of the nine Tropic of Cancer monuments in the world that features such strong acoustic resonance.