At+the+time+of+the+equinoxes
81Copernicus, Nicolaus — Polish Mikołaj Kopernik born Feb. 19, 1473, Toruń, Pol. died May 24, 1543, Frauenburg, East Prussia Polish astronomer. He was educated at Kraków, Bologna, and Padua, where he mastered all the knowledge of the day in mathematics, astronomy,… …
82Mithraic Mysteries — Top: Mithras killing the bull, being looked over by the Sun god and the Moon goddess. Bottom: Mithras banqueting with the Sun god.] The Mithraic Mysteries or Mysteries of Mithras (also Mithraism) was a Roman mystery religion which became popular… …
83Terminator (solar) — A terminator, twilight zone or grey line is a moving line that separates the illuminated day side and the dark night side of a planetary body. A terminator is defined as the locus of points on a moon or planet where the line through a sun is… …
84Greek astronomy — is the astronomy of those who wrote in the Greek language in classical antiquity. It is understood to include the ancient Greek, Hellenistic, Greco Roman, and Late Antiquity eras. It is not limited geographically to Greece or to ethnic Greeks, as …
85Universe — • Presents a history of astronomy Catholic Encyclopedia. Kevin Knight. 2006. Universe Systems of the Universe † …
86Gregorian calendar — For the calendar of religious holidays and periods, see Liturgical year. For this year s Gregorian calendar, see Common year starting on Saturday. 2011 in other calendars Gregorian calendar 2011 MMXI …
87Julian calendar — The Julian calendar began in 45 BC (709 AUC) as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year (known at… …
88Philosophiæ Naturalis Principia Mathematica —   Title page of Principia , first edition (1687) Original title …
89Almagest — Geometric construction used by Hipparchus in his determination of the distances to the sun and moon. The Almagest is a 2nd century mathematical and astronomical treatise on the apparent motions of the stars and planetary paths. Written in Greek… …
90global warming — an increase in the earth s average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect. [1975 80] * * * Potential increase in global average surface temperatures resulting from… …
