... Given the functions (sin?, cos?, sin? and cos ?), we seek formulas that express sin(?+?) and cos(?+ ... As shown in the drawing, to derive the formula we combine two right-angled triangles . ... The triangle ADF is right-angled and has the angle (?+ ... Each of them is one of the two sharp ("acute") angles in its own right-angled triangle. Since the sharp angles in such a triangle add up to 90 degrees, the other two sharp angles must be equal. ... In the right-angled triangle CED DE = DC cos ? ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. February 16, 1996 . The Early Universe . ... The above animated frame is the result of such a calculation and shows how our universe might have looked when it was just a fracton of its current age . ... As time progressed, gravity caused slight gatherings of mass to accrete so that ever greater conglomerations formed. ... About APOD | ...

HST has resumed science observations with NICMOS, FGS and WFPC2. ... Abstract . ... Leon Koopmans, Kapteyn Astronomical Institute . ... The largest Kuiper belt objects . ... Comprehensive Auroral Imaging of Jupiter and Saturn during the International Heliophysical Year . ... 2007 has been designated the International Heliophysical Year, and HST will be playing a key part in the associated scientific activities by participating in a detailed investigation of auroral activity in jupiter and Saturn. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Moon . Planets . ... Monthly Sky Notes . ... February . ... The ringed planet will be quite bright, but unlike Jupiter it will not be the brightest point of light in the sky, this accolade will return to Sirius which is the brightest star in our night sky in the constellation of Canis Major. ... Seven days later on February 18, the Moon will be in its full Moon phase. ... Tweets that mention Wonders of the February Night Sky | ... Astronotes . ...

Astronomy Picture of the Day . ... 16.02.1996 . ... February . ... February 1996 . ... 1995 1996 . ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: early universe . Publications with words: early universe . ... HUDF Infrared: Dawn of the Galaxies . GRB 090423: The Farthest Explosion Yet Measured . Building Galaxies in the Early Universe . ... BOOMERANG Images The Early Universe . Unexpected Galaxy String in the Early Universe . ...

... Main . ... April 2016 . ... December 2015 . November 2015 . October 2015 . September 2015 . August 2015 . July 2015 . June 2015 . May 2015 . April 2015 . March 2015 . February 2015 . January 2015 . December 2014 . November 2014 . October 2014 . September 2014 . August 2014 . July 2014 . June 2014 . May 2014 . April 2014 . March 2014 . ... December 2013 . ... April 2013 . ... December 2012 . ... April 2012 . ...

... The HI - Star Formation Connection . ... Coffee . ... Dark Galaxies and Dark Matter . ... HI in Normal Galaxies . HI and Galaxy Evolution over Cosmic Time . ... How Galaxies Accrete Gas . ... The Billion Galaxy Survey . ... Searches for Dark Galaxies . ... Evidence for Dark Matter in Galaxies . HI in Galaxies: Overview . ... Open Questions in Normal Galaxies . ... Starburst galaxies and BCDs . ... HI Rich Galaxies . ... Open Questions in HI and Galaxy Evolution . HI and Galaxy Evolution . ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . View of the planets Uranus, Venus and Mars in the early evening western sky after sunset, as seen from Armagh at 7.00pm on 1 March 2015. ... Armagh Observatory reports that the next two weeks provide a rare opportunity to observe the planets Venus, Mars and Uranus in the western evening sky after sunset, and the bright planet Jupiter rising high in the East about the same time. ...

... Archive for February 2007 . ... Sometime early this year, Jeremy Drake asked this innocuous sounding question in the context of determining the bounds on the amplitude of an absorption line: Is the 3sigma error bar the same length as 3 times the 1sigma error bar? ... Likelihoodists will say ?Maybe, yeah, er, depends?, and Bayesians will say ? ... Tags: Bayesian , central limit theorem , confidence bounds , error bar , Frequentist , highest posterior density , HPD , likelihoodist , sigma . ...

Victor VASSILIEV (Steklov Institute and IUM, Moscow): On the cohomology of spaces of self-intersecting curves . ... The homological obstructions to the existence of integer Gau\ss-like combinatorial formulas for such cohomology classes are calculated, in particular the first obstruction to the existence of an integer Polyak-Viro formula for invariants of knots in $\R^3$ is found. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. February 9, 1999 . A Supernova Star-Field . Credit: Hubble Heritage Team ( AURA / STScI / NASA ) . Explanation: Bright stars don't last forever. ... The above picture is a composite of recent images taken over several years. The explosion originated from a bright massive star that ran out of nuclear fuel . ... About APOD > . ...

... Some equations, identities or formulas contain small quantities , and these can be made much simpler and easier to use by sacrificing a little accuracy. ... When we derive squares, 3rd powers, 4th powers etc. of numbers larger than 1 , the results are always bigger , while for numbers smaller than 1 , the results are always smaller . ... power . ... number . ... The above also holds for negative numbers, if one understands "bigger" and "smaller" to refer to the absolute value (the value without sign...

. Although this design reduces the vignetting seen at the NA2 guider. We do not have a good feeling yet what the effect might be on scattered light at the focal plane.

Lab . Main page News People . ASA . Master . Master net Homepage . ... Lomonosov Moscow State University Sternberg Astronomical Institute . ... MASTER . ... Lomonosov (ShOK) . ... About Space Monitoring Laboratory, scientific directions, instruments, contacts . People, who work in lab . Latest news and news archive . ... All news ...

... Sun images . ... Active areas . February : 2016 . ... The following regions with sunspots can be now observed on the Sun's surface . Group number . ... Group length (in degrees) . ... Beta . ... Coordinates and other characteristics of active regions are issued for February 09, 2016 00:31 UT The following H-alpha plages without spots can be currently observed on the Sun's surface . ... Coordinates and other characteristics of active regions are issued for February 09, 2016 00:31 UT . ...

... Home Astro-Imaging Page 5 . ... AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . ... This MonthтАЩs Sky тАУ April 2015 . This MonthтАЩs Sky тАУ May 2015 . This MonthтАЩs Sky тАУ June 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 . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

January 8, 2010 (Friday) Eugene Lim, Columbia University . ... February 15, 2010 Mariangela Lisanti, Stanford . ... 4:00pm, 472 Willamette Hall . ... return to top . ... Jets of hadrons are produced both by decays of strongly-interacting new particles beyond the Standard Model and by ordinary Standard Model interactions in high-energy collisions. Discovering new physics at the Tevatron or LHC will require reliable identification of the underlying high-energy particles that produce different jets. ...

... Clayton C. Anderson . ... EDUCATION: Graduated from Ashland-Greenwood High School, Ashland, Nebraska, 1977; graduated cum laude with a Bachelor of Science degree in Physics from Hastings College, Nebraska, in 1981; and received a Master of Science degree in Aerospace Engineering from Iowa State University in 1983. ... Anderson also served as a space station Capsule Communicator (CAPCOM) and as the Astronaut Office Crew Representative for the space station electrical power system. ... JANUARY 2013 ...

... It seems that we are having teething problems with the new reference pointing capabilities. ... But it does not have some fixes for VEX problems that will affect CMVA runs. ... The changes here are not significant for users not attempting reference pointing with AUTOPEAK or other mechanism that invokes setup files with FORMAT=NONE . ... 07 Feb 2001 RCW . ... And this time, it only affects VEX users. ... Remove the ``*'' from a the names of many pointing sources in sources.pointing and peak.cmd . ...

The VLTI Calibrator Selector Tool is a tool intended to assist in the selection of suitable interferometric calibrators for VLTI observations with MIDI and AMBER. It uses a model of the VLTI and its instruments to assess the fringe visibility, given the observed bandpass, the geometry, spectrum, and coordinates of the target and the time at which the observations are to be made. ... The tool offers an HTML/Java based interface and consists of two pages. ... The quality flag depends on LDD_chi2. ...