apparent diameters

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• star cluster — Astron. a number of stars of common origin held together as a group by gravitational attraction. Cf. globular cluster, open cluster, stellar association. * * * ▪ astronomy Introduction  either of two general types of stellar assemblages held… …   Universalium

• galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium

• Hipparchus — (Greek polytonic|Ἵππαρχος; ca. 190 BC ndash; ca. 120 BC) was a Greek astronomer, geographer, and mathematician of the Hellenistic period.Hipparchus was born in Nicaea (now Iznik, Turkey), and probably died on the island of Rhodes. He is known to… …   Wikipedia

• Magnitude (astronomy) — For other uses, see Magnitude (disambiguation). Magnitude is the logarithmic measure of the brightness of an object, in astronomy, measured in a specific wavelength or passband, usually in optical or near infrared wavelengths. Contents 1… …   Wikipedia

• Magnitude of eclipse — Not to be confused with apparent magnitude, the logarithmic scale of astronomical brightness. An annular solar eclipse has a magnitude of less than 1.0 The magnitude of eclipse or geometric magnitude is the fraction of the diameter of the… …   Wikipedia

• Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …   Wikipedia

• Cor Caroli — seen from northern England on March 1, 2011. Cor Caroli (α CVn, α Canum Venaticorum, Alpha Canum Venaticorum, originally known by the more elaborate Cor Caroli Regis Martyris) is the brightest star in the northern constellation Canes Venatici.… …   Wikipedia

• History of astronomical interferometry — See also: astronomical interferometerWilliam Herschel knew as early as 1779 (Herschel 1805) that stars appeared much larger in telescopes than they really were but he did not know why. When Thomas Young demonstrated interference and the wave… …   Wikipedia

• Gliese 1 — GJ 1 Observation data Epoch J2000      Equinox J2000 Constellation Sculptor Right ascension 00h 05m 24.4279s[1] …   Wikipedia

• Solar eclipse — A solar eclipse occurs when the Moon passes between the Sun and the Earth so that the Sun is wholly or partially obscured. This can only happen during a new moon, when the Sun and Moon are in conjunction as seen from the Earth. At least two and… …   Wikipedia

• Solar eclipses on Pluto — Eclipses of the Sun on Pluto are caused when one of its three natural satellites – Charon, Nix and Hydra – passes in front of the Sun, blocking its light.An eclipse can occur only when one of the satellites orbital nodes, the points where their… …   Wikipedia