show more 26wks1dy pregnant. Why is it that in a singleton pregnancy, full term is considered 37wks, however in a twin pregnancy, full term is considered 35wks, & in a triplet pregnancy, full term is considered 31wks? Don't the babies in all pregnancies grow/develop at the same rate?hy is it that in a singleton pregnancy, full term is considered 37wks, however in a twin pregnancy, full term is considered 35wks, & in a triplet pregnancy, full term is considered 31wks?
For orbits around the Earth, see Geocentric orbit. In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system) is a superseded description of the universe with the Earth at the center. Under the geocentric model, the Sun, Moon, stars, and planets all circled Earth.
Heliocentric Universe. A heliocentric universe is a universe in which the sun is the center and the planets orbit around it. Copernicus was the first person to formulate this idea. The idea of a heliocentric universe was rejected by the Church because God's prized creation, Earth, should be at the center. geocentric universe is the model of the universe created by Ptolemy, in which everything in the universe (sun, stars, other planets, etc.) orbits around the Earth.