Title: Flag of Uruguay
Content:  The horizontal stripes on the flag represent the nine original departments of Uruguay, based on the U.S. flag, where the stripes represent the original 13 colonies. The first flag designed in 1828 had 9 light blue stripes; this number was reduced to 4 in 1830 due to visibility problems from distance. The golden Sun of May represents the May Revolution of 1810; the Sun of May is a figurative sun that represents Inti, the sun god and mythological founder of the Incan Empire. It also appears in the Flag of Argentina and the Coat of Arms of Bolivia.
Title: Coat of arms of Uruguay
Content:  It consists of an oval shield, which is divided into four equal sections and crowned by a rising golden sun, the “Sun of May”, symbolizing the rising of the Uruguayan nation and the May Revolution. The oval is surrounded by a laurel branch on the left and an olive one on the right, representing honor and peace, joined at the bottom by a light blue ribbon, the former uruguayan cockade. In the upper left quarter there is a golden scale on a blue background, symbol of equality and justice. The upper right quarter contains the Cerro de Montevideo (Montevideo Hill) with its fortress on top on a silver background, as a symbol of strength. In the lower left, also on a silver background, there is a galloping black horse, symbolizing liberty. The lower right quarter holds a golden ox on blue background, as a symbol of abundance.
Title: Flag of Uruguay
Content:  The national flag of Uruguay (Pabellón Nacional) is one of the three official flags of Uruguay along with the flag of Artigas and the flag of the Treinta y Tres. It has a field of nine equal horizontal stripes alternating white and blue. The canton is white, charged with the Sun of May, from which 16 rays extend, alternating between triangular and wavy. The flag was first adopted by law on December 18, 1828, and had 19 stripes until July 11, 1830, when a new law reduced the number of stripes to nine. The flag was designed by Joaquín Suárez.
Title: Sun of May
Content:  In the flag of Argentina, the Sun of May is the radiant golden yellow sun bearing the human face and thirty-two rays that alternate between sixteen straight and sixteen wavy. In the flag of Uruguay, the Sun of May is the golden yellow sun bearing the human face and sixteen triangular rays that alternate between eight straight and eight wavy. Inspired by the Latin American wars of independence, the Philippines which was a fellow former Spanish colony also adopted the Sun of May as a revolutionary banner. The Sun of May is found on the official logo of the Cypriot House 
Title: Sun of May
Content:  The Sun of May (Sol de Mayo) is a national emblem of Argentina and Uruguay, and appears on the flags of both countries.
Title: Sun (heraldry)
Content:  Armstrong, Canada, and the arms of Banbury Town Council, England. It also often appears as a rising sun as in the arms of East Devon District Council, England, and as a demi sun as in the coat of Aitchison, Canada. The Sun of May shown on the national flags of Argentina (1818), Uruguay (1828); in the flag and shield of the South-Peruvian State (1836 - 1839); on the flag and shield of the Peruvian-Bolivian Confederation (1836 - 1839); in the flag of Peru of 1812; in the current flag of the Peruvian Navy (1821); and in the current flag of the Argentine Army (1810)and that represents the Inca indigenous culture; specifically the Inca god of the sun "Inti" or also called "Sun of May", all of them identical in shape to the "Sun in Splendour".
Title: Solar symbol
Content:  Official insignia which incorporate rayed solar symbols include the Jesuit emblem, the flag of Uruguay, the flag of Kiribati, some versions of the flag of Argentina, the Irish Defence Forces cap badge, and the. The depictions of the sun on the flags of the Republic of China (Taiwan), Kazakhstan, Kurdistan, and Nepal have only straight (triangular) rays; that of Kyrgyzstan has only curvy rays; while that of the Philippines has short diverging rays grouped into threes. Another rayed form of the sun has simple radial lines dividing the background into two colors, as in the military flags of Japan and the current flag of North Macedonia, and in the top parts of the flags of Tibet and Arizona. The flag of New Mexico is based on the Zia sun symbol which has four groups of four parallel rays emanating symmetrically from a central circle.
Title: Flag of Argentina
Content:  The sun is called the Sun of May because it is a replica of an engraving on the first Argentine coin, approved in 1813, whose value was eight escudos (one Spanish dollar). It has 16 straight and 16 waved sunbeams. In 1978 the sun color was specified to be golden yellow (amarillo oro), to have an inner diameter of 10 cm, and an outer diameter of 25 cm (the diameter of the sun equals 5⁄6 the height of the white stripe. The sun's face is 2⁄5 of its height). It features 32 rays, alternately wavy and straight, and from 1978 it must be embroidered in the "Official Flag Ceremony".
Title: Order of the Oriental Republic of Uruguay
Content:  The blue and white cross has an enemelled Uruguayan coat of arms in the centre. The cross is topped by a Sun of May in silver or gold.
Title: Flag of Argentina
Content:  From 1978, the flag's official proportions are 9:14, and its official size is 0.9 by 1.4 meters. It features three stripes alternating sky blue, white and sky blue. Each stripe is 30 centimeters high. In the center stripe there is an emblem known as the Sun of May (Sol de Mayo), a golden sun. Historian Diego Abad de Santillán claimed that the Sun of May was a representation of the Inca sun god Inti. Flags with proportions of 1:2 and 2:3 are also in use.

Question: what does the sun represent on the uruguay flag?
Answer: the May Revolution of 1810.