The Tropic of Cancer is located at 23.5 degrees north latitude. The Tropic of Cancer Landmark is at the 69 kilometer marker on Highway 11. Every year at noon during the summer solstice, the sun shines right into the slits on the Tropic of Cancer. At this time, tourists can experience the phenomenon of shadowlessness under the sun.
1.The Tropic of Cancer at 23.5 degrees north latitude is the northen border of earth of the direct sunlight; In other words, on the summer solstice, the sun rises in the east and goes down in the west following the latitude. To coordinate this phenomenon, the tower is designed with a slit in the midle of the structure, so that visitors can observe this phenomenon.