... Los sat lites que estudian su entorno local, acostumbran a hacerlo por motivos cient ficos. ... Muchos sat lites que "miran hacia abajo" tambi n realizan observaciones locales, entre estos los Polar, Viking, Freja y los de las series GOES y DMSP. Quiz s los sat lites m s interesantes de este grupo son los que se env an a rbitas distantes, algunos de los cuales van m s all de la Luna, p.e. el veh culo WIND mostrado aqu . ... Pr xima etapa sobre Sat lites: #29d Sat lites para usos comerciales . ...

... Among the objectives of Principal Components Analysis are the following. dimensionality reduction; љ . the determining of linear combinations of variables; љ . ... identification of groups of objects or of outliers. ... Finding a set of principal axes allows the objects to be adequately characterised on a smaller number of (artificial) variables. ... Reduction of dimensionality is practicable if the first new axes account for approximately 75 % or more of the variance. ...

... Staff at the Armagh Observatory carry out research in the following principal areas: . ... Solar System Astronomy , including celestial mechanics, numerical and semi-analytic methods, the origin and dynamical evolution of comets, asteroids and meteorites, the evolution of interplanetary dust; the formation of Edgeworth-Kuiper belt objects, the origin and evolution of planetary systems, and the structure and evolution of extra-solar planetary systems. ... A few highlights from 1998: . ...

Next: Main-sequence stars (stage I) Up: Evolutionary Scenarios of Binary Previous: Evolutionary Scenarios of Binary . We begin with a description of normal star evolution. The evolutionary states of normal stars will be written using roman figures (I-IV), whereas those of compact stars will be denoted by capital letters (E, P, A, SA ...) (see Section  4 ). ... a main-sequence (MS) star inside its Roche lobe   (RL); . ... a post-MS star inside its RL; . ... Main-sequence stars (stage I) . ...

... Makarov D.I., Karachentsev I.D., Burennkov A.N., Tyurina N.V., Korotkova G.G. "Rotation curves of edge-on galaxies" . ... Karachentsev I.D., Makarov D.I., Sharina M.E., Dolphin A.E., Grebel E.K., Geisler D., Guhathakurta P., Hodge P.W., Karachentseva V.E., Sarajedini A., Seitzer P. "Local galaxy flows within 5 Mpc" . ... Karachentsev I.D., Makarov D.I. "Local Field of Galaxy Velocities" . ... Karachentsev I.D., Makarov D.I. "The Galaxy Motion Relative to Nearby Galaxies and the Local Velocity Field"...

... Tonight's Sky . ... News . Observing . ... Sky this Month . ... The Sky This Week: April 1 - 10 . ... Sky this Week . Observing Podcasts . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . Springtime observing for small telescopes . ... Seasonal Observing . ... Observing Basics . ... S. Alan Stern, New Horizons principal investigator . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Главные расслоения. Структурные уравнения главного расслоения. Связности в главных расслоениях. ... Структурные уравнения связности. ... Главное расслоение реперов. ... Структурные уравнения главного расслоения реперов. ... Связности в главном расслоении реперов и их структурные уравнения. Тензоры кручения и кривизны связности. ... Альтернативное определение аффинной связности. ... Альтернативное определение тензоров кручения и кривизны связности. ... Тензор аффинной деформации. ...

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... Algunos cient ficos pensaban que Tit n, una luna de Saturno, era m s grande, pero mediciones posteriores mostraron que parte del di metro aparente de Tit n es de hecho una atm sfera muy tupida. ... Io es as de activa porque est atrapada en una guerra de forcejeos entre las gravedades de J piter y Europa. Esta lucha atrapa a la impotente Io en una rbita el ptica, de manera que su distancia a J piter---y por lo tanto el efecto de la gravedad de J piter---cambia cont nuamente. ...

... Cameras NIC1, and NIC2, each contain 3 polarizers, whose principal axes of transmission are separated by 120 degrees. ... As with the imaging filters, sensitivity information for the two sets of polarizers may be obtained from the Exposure Time Calculator. It gives the same information as was described in Chapter 4: namely a sensitivity curve, plotted as flux against time for a constant S/N ratio and an exposure exclusion curve for both point and extended sources. ...

NATIONAL ASTRONOMY AND IONOSPHERE CENTER . ... Astronomy . ... Visitor Center . ... Dr. Colin Lonsdale received a Doctorate in Radio Astronomy, in 1981, from the Victoria University of Manchester, UK (Jodrell Bank Observatory) He currently holds the position of Director and Principal Research Scientist, MIT Haystack Observatory, Westford, MA. ... Closely parallel arrangements can be found at Jodrell Bank in the UK, and at Haystack Observatory in rural Massachusetts. ...

... Astrophysics Group . ... VLSS . ... To facilitate access for UK and European users, MRAO is providing a UK Mirror of the VLA Low-frequency Sky Survey (VLSS), which is being produced in the US jointly by NRAO and the Naval Research Laboratory (NRL). ... A catalog of discrete sources on these images created by fitting a elliptical Guassians to all sources detected at the 5 sigma level or higher. ... This survey contains publicly available images and catalog information on over 1.8 million radio...

... Corvus Capital, along with its own capital, has the backing of a number of international funding partners. ... MyCloudtag App has launched in the Apple App Store Google Play store! App Fitness & Health . Andrew Regan lead a 10 man team on the first ever there-and-back crossing of the Antarctica. ... CloudTag is a London Listed Company focused on the Fitness and Wellbeing Market. AIM Fitness & Health . Sirius Petroleum is an Oil Gas Company listed on London's AIM. AIM Oil & Gas . ...