... 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. ...

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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. ...

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• Identities

... 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 | ...

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• APOD: 2001 September 2 - Deimos: A Small Martian Moon
• APOD: November 15, 1998 - Deimos: A Small Martian Moon
• APOD: October 3, 1995 - Deimos: Small Martian Moon

... 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 . ...

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• Armagh Observatory Small Asteroids
• The Small Bodies of the outer Solar System: Wed 2 December, Belfast |
• Stars Beyond Maturity

... 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 . ...

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• Deimos: Small Martian Moon
• Астронет > Deimos: A Small Martian Moon
• Астронет > Deimos: Small Martian Moon

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. ...

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• HST FOS/COSTAR Small Aperture Spectroscopy of the Disk of Ionized Gas in M87
• The Damped R-L Iteration
• Small Polycyclic Aromatic Hydrocarbons in the Red Rectangle

... 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 [ ] . ...

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• Young Stars in the Small Magellanic Cloud | Astronotes
• Kepler-10c: the First Mega-Earth | Astronotes

... 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. ...

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• ASP: Shadow Play: 1998's Total Solar Eclipse
• ASP: The Story of Astronomy
• ASP: Stellar Evolution (a la Chez Stella)

... 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. ...

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• Small Magellenic Cloud
• Small planets have no atmospheres
• Things are very different for small planets

... 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 . ...

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• aaa-logo-by-marcelo-cabrera-(fonts-traced)-updated-small ? Amateur Astronomers
• Optical Surface Cleaning Procedure ? Amateur Astronomers Association of New...

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. ...

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• Jupiter's Moon Amalthea
• Fasti Talk Slide 11
• APOD: October 4, 1998 - One Small Step