The Blue Sky with a White Sun () is the national emblem of Taiwan.
In the "Blue Sky with a White Sun" symbol, the twelve rays of the white Sun representing the twelve months and the twelve traditional Chinese hours (), each of which corresponds to two modern hours and symbolizes the spirit of progress.
The national emblem of the Republic of China is officially described in the National Emblem and National Flag of the Republic of China Act:
The national emblem of the Republic of China is a blue sky with a white sun in the following form:
A blue circle.
A white sun in the middle, with 12 white rays with pointed angles.
There is a blue ring between the white sun and the white rays with pointed angles.
The position, angle and ratio of each subparagraph of the previous article are as follows:
The center of the blue background circle is the center of the white sun.
The ratio of the radius of the white sun to the radius of the surrounding blue circle is 1:3.
The length from the center of the white sun to the top of a white ray with a pointed angle is twice the length of the radius of the white sun.
The width of the blue ring between the white sun and the 12 white rays with pointed angles is equivalent to 1/15 of the diameter of the white sun.
The top angle of each white ray with a pointed angle is 30 degrees, with the 12 rays totaling 360 degrees.
The upper, lower, left and right sides of the white rays with pointed angles shall be facing north, south, east and west. The rest shall be evenly spread out.
The "Blue Sky with a White Sun" flag was originally designed by Lu Hao-tung, a martyr of the Republican revolution. He presented his design to represent the revolutionary army at the inauguration of the Society for Regenerating China, an anti-Qing society in Hong Kong, on February 21, 1895.
During the Wuchang Uprising in 1911 that heralded the Republic of China, the various revolutionary armies had different flags. Lu Hao-tung's "Blue Sky with a White Sun" flag was used in the southern provinces of Guangdong, Guangxi, Yunnan, and Guizhou, while the "18-Star Flag", "Five-Colored Flag", and other designs were used elsewhere.