Today it is the day of Inti Raymi in Cusco, a big festival celebrated each year the 24th of June.
Inti Raymi was the most important of four ceremonies celebrated in Cusco, as related by Inca Garcilaso de la Vega. The celebration took place in the Haukaypata or the main plaza in the city.
The Inti Raymi,or "Festival of the Sun" was a religious ceremony of the Inca Empire in honor of the god Inti, one of the most venerated gods in Inca religion. It really was the celebration of the Winter Solstice - the shortest day of the year in terms of the time between sunrise and sunset.
In this part of South America, the months of June & July are Winter months.
According to chronicler Garcilaso de la Vega, Sapa Inca Pachacuti created the Inti Raymi to celebrate the new year in the Andes of the Southern Hemisphere. Since 1944, a theatrical representation of the Inti Raymi has been taking place at Sacsayhuamán (just above Cusco at two km. ) on June 24 of each year, attracting thousands of tourists and local visitors. The ceremony was also said to indicate the mythical origin of the Incas. It lasted for nine days and was filled with colorful dances and processions, as well as animal sacrifices to ensure a good cropping season. The last Inti Raymi with the Inca Emperor's presence was carried out in 1535, after which the Spanish conquest and the Catholic Church share it.
In 1944, a historical reconstruction of the Inti Raymi was directed by Faustino Espinoza Navarro and indigenous actors. The first reconstruction was largely based on the chronicles of Garcilaso de la Vega and only referred to the religious ceremony.
Inti Raymi is still celebrated in indigenous cultures throughout the Andes. Celebrations involve music, colorful costumes (most notable the woven aya huma mask) and the sharing of food. In many parts of the Andes, this celebration has been connected to the festivals of Saint John the Baptist, which falls on the day after the northern solstice (June 21).
edited from Wikipedia http://en.wikipedia.org/wiki/Inti_Raymi