EarthThird planet from the SunSurface equivalent doserate0.274 μSv/hAbsolute magnitude (H)−3.99AtmosphereSurface pressure101.325 kPa (at sea level)Composition by volume78.084% nitrogen (dry air)20.946% oxygen (dry air)≤1% water vapor (variable)0.9340% argon0.0430% carbon dioxide0.00182% neon0.00052% helium0.00017% methane0.00011% krypton0.00006% hydrogen Source:Earth is the third planet from the Sun and the only astronomical object known to harbor life.
Lunar monthIn lunar calendars, a lunar month is the time between two successive syzygies of the same type: new moons or full moons. The precise definition varies, especially for the beginning of the month. VariationsIn Shona, Middle Eastern and European traditions, the month starts when the young crescent moon first becomes visible, at evening, after conjunction with the Sun one or two days before that evening (e.g., in the Islamic calendar).
De revolutionibus orbium coelestiumDe revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres) is the seminal work on the heliocentric theory of the astronomer Nicolaus Copernicus (1473–1543 CE). The book, first printed in 1543 CE in Nuremberg, Holy Roman Empire, offered an alternative model of the universe to Ptolemy's geocentric system, which had been widely accepted since ancient times.
MoonNatural satellite orbiting EarthSurface absorbed doserate13.2 μGy/h(during lunar daytime)Surface equivalent doserate57.0 μSv/h(during lunar daytime)Apparent magnitude−2.5 to −12.9−12.74 (mean full moon)Absolute magnitude (H)0.2Angular diameter29.3 to 34.1 arcminutesAtmosphereSurface pressure10 Pa (1 picobar) (day)10 Pa (1 femtobar) (night)Composition by volumeHeArNeNaKHThe Moon is the only natural satellite of Earth.
Deferent and epicycleIn the Hipparchian, Ptolemaic, and Copernican systems of astronomy, the epicycle (from Ancient Greek ἐπίκυκλος (epíkuklos) 'upon the circle', meaning "circle moving on another circle") was a geometric model used to explain the variations in speed and direction of the apparent motion of the Moon, Sun, and planets. In particular it explained the apparent retrograde motion of the five planets known at the time.
SunStar at the centre of the Solar SystemThe Sun is the star located at the centre of the Solar System. It is a massive sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation, with 10% at ultraviolet energies. It is the main source of energy for life on Earth.
Copernican heliocentrismCopernican heliocentrism is the astronomical model developed by the RenaissanceastronomerNicolaus Copernicus and published in 1543. This model positioned the Sun near the center of the Universe, motionless, with Earth and the other planetsorbiting around it in circular paths, modified by epicycles, and at uniform speeds. The Copernican model challenged the geocentric model of Ptolemy that had prevailed for centuries, which had placed Earth at the center of the Universe.
Nicolaus CopernicusMathematician and astronomer (1473–1543)
RomeCapital and largest city of ItalyCapital city and comune in ItalyRome is the capital and largest city of Italy. It is also the administrative centre of the Lazioregion and of the Metropolitan City of Rome. A special municipality named Roma Capitale with a population of 2.7 million in an area of 1,287.36 km (497.1 mi), Rome is the third most populous city in the European Union by population within city limits.
Johann Albrecht WidmannstetterJohann Albrecht Widmannstetter, also called Widmannstadt, Johannes Albertus or Widmestadius, (1506 – 28 March 1557) was a German humanist, orientalist, philologist, and theologian. LifeWidmannstetter was born in Nellingen/Blaubeuren near Ulm. He studied law, theology and oriental languages in Tübingen. After 1527, he continued his studies in Italy, in Turin, Naples and Rome, focusing on the languages of Syriac and Arabic.
Pope Clement VIIHead of the Catholic Church from 1523 to 1534Pope Clement VII (Latin: Clemens VII; Italian: Clemente VII; born Giulio di Giuliano de' Medici; 26 May 1478 – 25 September 1534) was head of the Catholic Church and ruler of the Papal States from 19 November 1523 to his death on 25 September 1534.
Nikolaus von SchönbergNikolaus von Schönberg (11 August 1472 – 7 September 1537) was a German Catholic cardinal and Archbishop of Capua.
Archdiocese of CapuaThe Archdiocese of Capua (Latin: Archidioecesis Capuana) is a Latindiocese of the Catholic Church in Capua, in Campania, Italy, but its archbishop no longer holds metropolitan rank and has no ecclesiastical province. Since 1979, it is a suffragan of the Archdiocese of Napoli, i.e. no longer has its own ecclesiastical province nor metropolitan status. HistoryAccording to the tradition, Christianity was first preached at Capua by St. Priscus, a disciple of St. Peter.*As an Amazon Associate I earn from qualifying purchases.