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Hace 3 días · Galileo di Vincenzo Bonaiuti de' Galilei (15 February 1564 – 8 January 1642), commonly referred to as Galileo Galilei (/ ˌ ɡ æ l ɪ ˈ l eɪ oʊ ˌ ɡ æ l ɪ ˈ l eɪ / GAL-il-AY-oh GAL-il-AY, US also / ˌ ɡ æ l ɪ ˈ l iː oʊ-/ GAL-il-EE-oh -, Italian: [ɡaliˈlɛːo ɡaliˈlɛːi]) or simply Galileo, was an Italian astronomer, physicist and engineer, sometimes described as a ...
Hace 5 días · The Julian calendar does not include the year 0. Thus the year 1 BCE is followed by the year 1 CE (See: BCE/CE Dating Conventions ). This is awkward for arithmetic calculations. Years in this catalog are numbered astronomically and include the year 0. Historians should note there is a difference of one year between astronomical dates ...
Hace 3 días · 2016 (Thursday) 2015 (Wednesday) January 7 is the seventh day of the year in the Gregorian calendar; 358 days remain until the end of the year (359 in leap years ).
Hace 4 días · Kepler’s laws of planetary motion, in astronomy and classical physics, laws describing the motion of planets in the solar system. They were derived by the German astronomer Johannes Kepler, who announced his first two laws in the year 1609 and a third law nearly a decade later, in 1618.
- What does Kepler’s first law mean?Kepler’s first law means that planets move around the Sun in elliptical orbits. An ellipse is a shape that resembles a flattened circle. How much t...
- What is eccentricity and how is it determined?The eccentricity of an ellipse measures how flattened a circle it is. It is equal to the square root of [1 - b*b/(a*a)]. The letter a stands for th...
- What is the meaning of Kepler’s third law?How long a planet takes to go around the Sun (its period, P) is related to the planet’s mean distance from the Sun (d). That is, the square of the...
- Why is a planet’s orbit slower the farther it is from the Sun?A planet moves slower when it is farther from the Sun because its angular momentum does not change. For a circular orbit, the angular momentum is e...
- Where is Earth when it is traveling the fastest?It follows from Kepler’s second law that Earth moves the fastest when it is closest to the Sun. This happens in early January, when Earth is about...
Hace 4 días · Moon, Earth’s sole natural satellite and nearest celestial body. Known since prehistoric times, it is the brightest object in the sky after the Sun. Its name in English, like that of Earth, is of Germanic and Old English derivation.
Hace 4 días · supernova, any of a class of violently exploding stars whose luminosity after eruption suddenly increases many millions of times its normal level. The term supernova is derived from nova (Latin: “new”), the name for another type of exploding star. Supernovae resemble novae in several respects.
Hace 4 días · Sirius is the brightest star in the night sky. Its name is derived from the Greek word Σείριος (Latin script: Seirios ), meaning lit. 'glowing' or 'scorching'. The star is designated α Canis Majoris, Latinized to Alpha Canis Majoris, and abbreviated α CMa or Alpha CMa. With a visual apparent magnitude of −1.46, Sirius is almost twice ...
