* Solar constant, the total radiation energy received from the Sun per unit of time per unit of area on a theoretical surface perpendicular to the Sunâs rays and at Earthâs mean distance from the Sun. Mean Venus-sun distance is 0.72 times the mean earth-sun distance. Since then, numerous spacecraft from the U.S. and other space agencies have explored Venus, including NASAâs Magellan , which mapped the planet's surface with radar. Irradiance is sometimes referred to as flux and is a measurement of electromagnetic energy from the sun. https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html Contents[show] Overall The Sun's energy output is 1.361 kW/square meter or 1.951 calories per minute, at Earth's orbit. Assume the sun to be a blackbody emitter at 5777 K (A) larger than A Typical solar granule is about the size of (A) a U.S. city, (B) a large U.S. state, (C) the Moon, (D) Earth. What is solar constant value? Venus, Mars and Earth, three out of the four inner or ârockyâ planets of the Solar System, have a lot in common â a solid surface you could walk on, a comparable surface composition, an â¦ Back to Math And Terraforming The solar constant is the energy output of the Sun or another celestial body as received on the orbit of Earth or another planet, moon or asteroid. What would be the ââsolar constantââ for Venus? Astronomers on Venus would measure a solar constant (A) larger than, (B) smaller then, (C) the same as on earth. A long-lived cyclone on Venus, first observed in 2006, appears to be in constant flux, ... Venus is the brightest planet in our solar system, has a hellish atmosphere, and is covered in volcanoes. Venus was the first planet to be explored by a spacecraft â NASAâs Mariner 2 successfully flew by and scanned the cloud-covered world on Dec. 14, 1962. The planet Venus is different from the earth in several respects. Physical Constants Name Value speed of light ( c ) 2.9979 × 10 8 m/s gravitational constant ( G ) 6.674 × 10 â11 m 3 /(kg s 2 ) Astronomical Units/Data NAME SYMBOL NUMBER EXP CGS UNITS ----- Astronomical unit AU 1.496 13 cm Parsec pc 3.086 18 cm Light year ly 9.463 17 cm Solar mass M o 1.99 33 g Solar radius R o 6.96 10 cm Solar luminosity L o 3.9 33 erg s-1 Solar Temperature T o 5.780 3 K ----- The solar constant is calculated by multiplying the sun's surface irradiance by the square of the radius of the sun over the average distance between the Earth and the sun. First, it is only 70% as far from the sun.