Solar irradianceSolar irradiance is the power per unit area (surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Solar irradiance is measured in watts per square metre (W/m2) in SI units. Solar irradiance is often integrated over a given time period in order to report the radiant energy emitted into the surrounding environment (joule per square metre, J/m2) during that time period. This integrated solar irradiance is called solar irradiation, solar exposure, solar insolation, or insolation.
CharleroiCharleroi (UKˈʃɑːrlə.rwʌ, US-rɔɪ,_-rwɑː, ʃaʁləʁwa; Tchålerwè tʃɑːlɛʀwɛ) is a city and a municipality of Wallonia, located in the province of Hainaut, Belgium. The city is situated in the valley of the Sambre, in the south-west of Belgium, not far from border with France. By 1 January 2008, the total population of Charleroi was 201,593. The metropolitan area, including the outer commuter zone, covers an area of with a total population of 522,522 by 1 January 2008, ranking it as the 5th most populous in Belgium after Brussels, Antwerp, Liège, and Ghent.
Paris MétroThe Paris Métro (Métro de Paris metʁo də paʁi; short for Métropolitain metʁɔpɔlitɛ̃) and operated by the Régie autonome des transports parisiens (RATP) is a rapid transit system in the Paris metropolitan area, France. A symbol of the city, it is known for its density within the capital's territorial limits, uniform architecture and unique entrances influenced by Art Nouveau. The system is long, mostly underground. It has 308 stations of which 64 have transfers between lines.
PolychromePolychrome is the "practice of decorating architectural elements, sculpture, etc., in a variety of colors." The term is used to refer to certain styles of architecture, pottery or sculpture in multiple colors. When looking at artworks and architecture from antiquity and the middle ages, people tend to believe that they were monochrome. In reality, the pre-Renaissance past was full of colour, and all the Greco-Roman sculptures and Gothic cathedrals, that are now white, beige or grey, were initially painted in bright colours.
