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1 godzinę temu · For the purpose of measurement, the Sun's radius is considered to be the distance from its center to the edge of the photosphere, the apparent visible surface of the Sun. By this measure, the Sun is a near-perfect sphere with an oblateness estimated at 9 millionths, which means that its polar diameter differs from its equatorial diameter by ...
1 dzień temu · Pittsburgh (/ ˈ p ɪ t s b ɜːr ɡ / PITS-burg) is a city in and the county seat of Allegheny County, Pennsylvania, United States.It is the second-most populous city in Pennsylvania, after Philadelphia, and the 68th-most populous city in the U.S., with a population of 302,971 as of the 2020 census.The city is located in southwestern Pennsylvania at the confluence of the Allegheny River and ...
