. The command man gives you access to an on-line manual containing a complete description of every command available on this system. man can also provide you with one line descriptions of commands specified by name; or for all commands whose description contains any of a set of keywords. Understanding the organisation of the manual . Searching by keyword . Checking the description of a command . Viewing manual pages . Printing manual pages .

It is a matter of common knowledge that in processes of genesis and evolution of many solar phenomena participate magnetic fields of sunspots. ... As a basis for formation of the database we take data on magnetic fields, collected by set of observatories during many years of observations. ... Section "Magnetic field data" contains data of magnetic field observation for separate sunspots, presented in standard text format (ASCII). ... Description of structure of these files is presented here . ...

... AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . ... This MonthтАЩs Sky тАУ April 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 . ... The Amateur Astronomers Association of New York was founded in 1927. ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... The 11 th International Astronomy Olympiad has been held successfully in Bombay (Mumbai) on November 10-19, 2006. The duration of the Olympiad was 10 days, it is one day longer than usualy. ... The International Astronomy Olympiad has been held in Europe and Caucasus for nine times, the X IAO visited East Asia, and now it is the first time IAO coming to South Asia. ... Friday, November 10 - Day of arrival . ... Dr. Michael G. Gavrilov, Founding Chairman of the International Astronomy Olympiad, . ...

. CDS: - Catalogues and files available at CDS . HEASARC - HEASARC Browse: Main Interface . SIMBAD - SIMBAD Quaery Form . WEBDA - Description . Variable Stars - Variable Stars in Globular Clusters . Page is modefied 27.04.2006 . E-Mail: marsakov@ip.rsu.ru

... Over the past few years we have sharpened our focus to concentrate on educating the educators-- amplifying our efforts hundreds of times over by working with teachers of all descriptions--K­12 classroom teachers, museum and science center staffers, college faculty, even amateur astronomers who do public outreach. Your tax deductible gift to the ASP Annual Fund supports our focus on education and outreach. ... Working together, we can make a difference. ...

... Bad Astronomy . ... Bitesize Astronomy . ... The next step up are true clusters, called open clusters . Open clusters (sometimes misleadingly called "galactic clusters") are groups of stars ranging in size from a few dozen stars up to tens of thousands. ... The youngest is about 1 or 2 million years old, while the oldest is about 6 or 7 billion years, making it just older than our own solar system. ... So by looking at the stars in the cluster we can tell pretty well how old they are. ...

... Model . ... Karpachev A.T., IZMIRAN, e-mail: karp@izmiran.ru . ... To the Model: . The empirical median model of the shape and position of the MIT (Main Ionospheric Trough) in the Northern and Southern Hemispheres is presented. ... Geomagnetism and aeronomy, v.26, № 1, p.63-68, 1986. ... Karpachev A.T., Afonin V.V. Dependence of the ionospheric trough occurrence probability on the season, local time, longitude, and level of magnetic activity Geomagnetism and aeronomy, v.38, № 3, p.79-91, 1998. ...