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Upside-down marks, simple in the era of hand typesetting, were originally recommended by the Real Academia Española (Royal Spanish Academy), in the second edition of the Ortografía de la lengua castellana (Orthography of the Castilian language) in 1754 [3] recommending it as the symbol indicating the beginning of a question in written Spanish—e.g. "¿Cuántos años tienes?"
The asterisk (/ ˈ æ s t ər ɪ s k / *), from Late Latin asteriscus, from Ancient Greek ἀστερίσκος, asteriskos, "little star", [1] [2] is a typographical symbol. It is so called because it resembles a conventional image of a heraldic star.
Abertura Photovoltaic Power Station (Spanish: Parque Fotovoltaico Abertura Solar) is a photovoltaic power station in the municipality of Abertura, Cáceres in Spain. It has a total capacity of 23.1 MWp. [1] The solar park was built by Iberinco. Double axes solar trackers were provided by Mecasolar and Inspira.
Solar potential of Mexico. Solar power in Mexico has the potential to produce vast amounts of energy. 70% of the country has an insolation of greater than 4.5 kWh/m 2 /day. . Using 15% efficient photovoltaics, a square 25 km (16 mi) on each side in the state of Chihuahua or the Sonoran Desert (0.01% of Mexico) could supply all of Mexico's electr
Total solar power in Spain reached nearly 7 GW by the end of 2016 including both installed PV and CSP. [99] Nearly 8 TWh of electricity was generated from photovoltaics, and 5 TWh from CSP plants in 2016. [100] Solar PV accounted for nearly 3% of total electricity generation in 2016 along with an additional of 1.9% from solar thermal. [101]
A solar cell, also known as a photovoltaic cell (PV cell), is an electronic device that converts the energy of light directly into electricity by means of the photovoltaic effect. [1] It is a type of photoelectric cell, a device whose electrical characteristics (such as current, voltage, or resistance) vary when it is exposed to light.
The Stonyhurst heliographic coordinate system, developed at Stonyhurst College in the 1800s, has its origin (where longitude and latitude are both 0°) at the point where the solar equator intersects the central solar meridian as seen from Earth. Longitude in this system is therefore fixed for observers on Earth.
The nominal power of PV devices is measured under standard test conditions (STC), specified in standards such as IEC 61215, IEC 61646 and UL 1703. Specifically, the light intensity is 1000 W/m 2, with a spectrum similar to sunlight hitting the Earth's surface at latitude 35°N in the summer (airmass 1.5), the temperature of the cells being 25 °C.