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The solar constant is the amount of power that the Sun deposits per unit area that is directly exposed to sunlight. The solar constant is equal to approximately 1,368 W/m 2 (watts per square meter) at a distance of one astronomical unit (AU) from the Sun (that is, at or near Earth's orbit). [99]
In 2023, solar power generated 5.5% (1,631 TWh) of global electricity and over 1% of primary energy, adding twice as much new electricity as coal. [65] [66] Along with onshore wind power, utility-scale solar is the source with the cheapest levelised cost of electricity for new installations in most countries. [67] [68] As of 2023, 33 countries ...
Although the solar corona is a source of extreme ultraviolet and X-ray radiation, these rays make up only a very small amount of the power output of the Sun (see spectrum at right). The spectrum of nearly all solar electromagnetic radiation striking the Earth's atmosphere spans a range of 100 nm to about 1 mm (1,000,000 nm).
In the Bible, Malachi 4:2 mentions the "Sun of Righteousness" (sometimes translated as the "Sun of Justice"), [15] [16] which some Christians have interpreted as a reference to the Messiah . [17] In ancient Roman culture, Sunday was the day of the sun god. In paganism, the Sun was a source of life, giving warmth and illumination.
Some 91% of the solar energy is produced within this radius. Within 24% of the radius (the outer "core" by some definitions), 99% of the Sun's power is produced. Beyond 30% of the solar radius, where temperature is 7 million K and density has fallen to 10 g/cm 3 the rate of fusion is almost nil. [7]
The Sun before sunrise is called Savitr, and after sunrise until sunset it is called Sūrya. [4] Savitr is venerated in the Rig Veda , the oldest component of the Vedic scriptures. He is first recorded in book three of the Rigveda; (RV 3.62.10) later called the Gayatri mantra .
Sol is the personification of the Sun and a god in ancient Roman religion.It was long thought that Rome actually had two different, consecutive sun gods: The first, Sol Indiges (Latin: the deified sun), was thought to have been unimportant, disappearing altogether at an early period.
Sol Invictus (Classical Latin: [ˈsoːɫ ɪnˈwɪktʊs], "Invincible Sun" or "Unconquered Sun") was the official sun god of the late Roman Empire and a later version of the god Sol. The emperor Aurelian revived his cult in 274 AD and promoted Sol Invictus as the chief god of the empire.