... Deriving sines cosines . ... Let the sides of the triangle be named ( a,b,c ), each matching the name of the angle across from it. ... a / c = sin A -- "the sine (or sinus) of A" . ... This statement is usually written with the square written sin 2 A (not sinA 2 , which might be taken to mean the sine of an angle equal to A 2 ): . ... The length of side a then approaches that of c , while the length of b becomes very small: therefore as A approaches 90њ, sinA approaches 1 and cosA approaches zero. ...

Triangles come in many shapes. ... Subtracting 90њ from both sides . ... a / c = sin A -- "the sine (or sinus) of A" . b / c = cos A -- "the cosine (or cosinus) of A" . ... This statement is usually written with the square written sin 2 A (not sinA 2 , which might be taken to mean the sine of an angle equal to A 2 ): . ... The length of side a then approaches that of c , while the length of b becomes very small: therefore as A approaches 90њ, sinA approaches 1 and cosA approaches zero. ...

... 2005 April 29 . Small Moon Epimetheus . Credit: Cassini Imaging Team , SSI , JPL , ESA , NASA . Explanation: Small saturnian moon Epimetheus ( ep-ee-MEE-thee-us ) is at most 116 kilometers across. ... Similar in size, saturnian moon Janus occupies an orbit separated from Epimetheus' by only about 50 kilometers. ... The small moons are also believed to play a role in maintaining the outer edge of Saturn's A ring . Tomorrow's picture: The Moons of Earth . ... About APOD | ...

... A small, newly-discovered asteroid named 2008 TC3 is approaching Earth and chances are good that it will hit. ... Monday, 6 October 2008 23:47 . International Year of Astronomy, Ireland National Node . ...

... Pacman and Hartley . ... It may become a naked-eye comet, just visible in clear, dark skies. Aurora Over Alaska . ... Are those green clouds or aurora? Photographed above two weeks ago, puffy green aurora help the Moon illuminate the serene Willow Lake and the snowy Wrangell and Saint Elias Mountains in eastern Alaska, USA. Horsehead and Orion Nebulas . ... The dark Horsehead Nebula and the glowing Orion Nebula are contrasting cosmic vistas. ... Rolling Across the Rocky Plains of Mars . ...

We estimate the conversion factor relating CO emission to H2 mass, ЮБCO, in five Local Group galaxies that span approximately an order of magnitude in metallicityт?? ... We model the dust mass along the line of sight from infrared (IR) emission and then solve for the ЮБCO that best allows a single gas-to-dust ratio (ЮДGDR) to describe each system. ... These results are consistent with the conversion factor becoming a strong function of metallicity around 12 + log (O/H) ~ 8.4-8.2. ...

... Armagh Planetarium . ... Universe . ... Posted on April 19, 2012 | ... Continue Reading.. ... 2 Comments In the upcoming weeks you will be hearing in the news the words тАЬDragon SpacecraftтАЭ, so Sinead McNicholl has the full story on what exactly this new vehicle is and [ ] . ... Posted on March 29, 2012 | 3 Comments The month of April is fantastic month for stargazing and for astronomy in general with numerous dates to mark in your calendar. €аFrom Earth Day celebrated on 22 April, in [ ] . ...

... Its perihelion would occur on April 1, 1997, at which point the comet would be only 0.92 astronomical units from the Sun, just within the orbit of Earth. ... Taken in April 1993, the photo showed the comet over 13 astronomical units from the Sun, well beyond the orbit of Saturn. ... Hale, as in Comet Hale-Bopp, has written a book, Everybody's Comet (available through the ASP Catalog) and coordinated an Internet project, "Hale-Bopp: Live in the American Classroom." ... Anatomy of a comet. ...

... Gallery . ... Remains of dewars and small instruments fromтАж . Sidebar Left . ... Title: Remains of dewars and small instruments from the drawing office. Description: NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ... Remains of dewars and small instruments from the drawing office. NOTE: All images and movies are copyright and must not be reproduced or mirrored in any form without written permission. ...

... Home aaa-logo-by-marcelo-cabrera-(fonts-traced)-updated-smaller . ... Lecture Series 2014-2015 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Published February 15, 2015 at dimensions 250 250 in aaa-logo-by-marcelo-cabrera-(fonts-traced)-updated-smaller . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

Comets are small, fragile, irregularly shaped bodies composed of a mixture of non-volatile grains and frozen gases. ... Most become visible, even in telescopes, only when they get near enough to the Sun for the Sun's radiation to start subliming the volatile gases, which in turn blow away small bits of the solid material. ... Nearly 100 known comets have periods (the time it takes them to make one complete trip around the Sun) five to seven Earth years in length. ...

Next: To compress and display Up: *display, xdisplay, xexamine* - Previous: *display, xdisplay, xexamine* - . To display an image, once SAOimage or Imtool is running: . cfa#: cl # Initiate IRAF from within one of the windows cl> images # Load the relevant package im> xray # Necessary if demonstration file used. ...

. Album : asv-album :: Travels to distant places and countries :: 1998/03 Tashkent (Uzbekistan) . Up . << Prev . In the small park near the town centre. Next >> . Photo album generated by album a script written by David on Tue Jun 23 14:46:30 2015 .

... Big telescopes are very powerful and zoom in on objects in the Universe that can t be seen using just our eyes or small telescopes. But if astronomers want to photograph large areas of the sky, then they usually use small telescopes instead. Astronomers often talk about the size of the area captured in a space photo by how much room the objects in it take up in the night sky. ... Most big telescopes can only capture an area of the night sky that is much smaller than 1 degree wide. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . Springtime observing for small telescopes . ... small (4 inches or smaller) . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Для представления текста малым шрифтом, например, для обозначения текста меньшей важности. ... Текстовый контейнер , т.е. любой элемент, который может содержать текстовые элементы . ... Текстовые элементы могут быть вложенными . ... Неясно, получится ли тот же результат при использовании мелкого шрифта и единственного элемента SMALL, что и при задании более крупного шрифта и вложенных SMALL. Элемент FONT может обеспечить больше вариантов для спецификации различных размеров шрифта. ...

Planetary Formation is though to occur via an accretion process in a disk of gas and dust that settles into orbit about the host star. ... The identification of dusty disks around young stars would constitute excellent evidence that this process is common and that planetary formation is a natural consequence of star formation. ... This discovery, courtest of Dr. C. O'Dell at Rice University, is consistent with previous discoveries of dusty disks around nearby stars. ...

... The Third Catalog of Emission Line Stars (Herbig & Bell 1988) and the General Catalog of Herbig-Haro Objects (Reipurth 1994) have both been translated into hypertext and linked to other on-line material. ... In recent years astronomical catalogs have disappeared from the archival literature. ... This spring I received a request from Bo Reipurth of ESO to review his preliminary General Catalog of Herbig-Haro Objects (Reipurth 1994) before it was made available via anonymous FTP from the ESO FTP...

About us . ... Telescopes . ... Apart from the 6-meter telescope BTA two small telescopes are operative at SAO: the 1-m and 0.6-m telescopes, both manufactured by Carl Zeiss, Jena, are located near the BTA. ... These telescopes are used for adjusting the equipment and techniques of observations used at the BTA. ... The observational time allocation and also a brief description of the equipment of the 1-m telescope, which is used either permanently or mainly on this telescope, are presented below. ...