... Procedure . ... The alignment telescope is delicate and extremely expensive; treat it carefully. ... Manhole cover" and associated shoulder screws and pins: the fixture used to mount the alignment telescope to the 2.5m instrument rotator. ... Adjust the focus of the crosshairs of the alignment telescope by rotating the eyepiece. ... Record the position of the alignment telescope's crosshairs on the secondary mirror's dimple (e.g. by making a sketch). ... Adjust the mirror until it is collimated: . ...

Astronomy Discussion Forums . Forums: . Atm ћ Astrophotography ћ Blackholes ћ Blackholes2 ћ CCD ћ Celestron ћ Domes ћ Education . ... Discussion Forums . ... Note The Change . Forum List | ... Post Message | ... www.astronomy.net . ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Since founding of the Olympiad] The Olympiad participants are not supposed to study at any institutions of higher education (university or school which can be considered technical colleges). ... Note: Exception may be done for the second time participating in IAOs students not older than 14.00 years on January 1st of the year of the Olympiad (i.e. born after January 01, 2000). ... Team of region, city, town: . ... of the XIX International Astronomy Olympiad (2014), . ...

. Name . Last modified . Size . Description . Parent Directory . - . dwsitecolumnsme.xml . 04-Oct-2002 11:12 . 729 .

... In this vibrant, eye-opening tour of milestones in the history of our universe, Chris Impey guides us through space and time, leading us from the familiar sights of the night sky to the dazzlingly strange aftermath of the Big Bang. ... Cambridge 2010, ISBN: 978-0521180665, Paperback $28.99 . ... Finding the Big Bang . ... As a prelude the book traces the evolution of some of the notions of modern cosmology from the late Middle Ages up to the final acceptance of the concept of galaxies in 1925. ...

... Le terme "aurores bor ales" a t utilis en 1621 par le scientifiqueet philosophe fran ais Pierre Gassendi , mais George Siscoe a donn des raisons de croire qu'il aurait t introduit par Galil e en 1619 (p. 51 dans "Majestic Lights", cit ci-dessus). En 1860, Elias Loomis de l'universit de Yale tablit une carte qui indiquait en diff rents lieux, le nombre de fois en moyen sur un an o les aurores bor ales avaient t observ es (cliquez ici pour voir sa carte). ... Plus sur ses photos, ici. ...

... 400mm f/2.8 Nikor lens: images the sky on the entrance slit. ... The optical system maintains image quality along the slit length so that each row of the image is a spectrum of that spatially selected region of the sky. 180mm f/2.8 Nikor lens: collimates the light from the slit. ... The auxiliary optical platform on WISPI now accomodates a short focal lens and a guiding/imaging video system that may use sub-pixel corrections to provide feedback to the tracking drive motors. ...

... Il est bien entendu que par ce mot ?mers? nous dйsignons ces immenses espaces, qui, probablement recouverts par les eaux autrefois, ne sont plus actuellement que de vastes plaines. ... Seul, le monde d'Uranus offre une diffйrence assez marquйe : les mouvements de ses Lunes s'effectuent dans une direction presque perpendiculaire au plan de l'orbite, et la direction de ses mouvements est rйtrograde, c'est-а-dire que ses satellites se meuvent en sens inverse des autres astres du monde solaire. ...

I/146 Positions and Proper Motions (Roeser+ 1988) ================================================================================ Catalogue of Positions and Proper Motions Roeser S., Bastian U. =1988A .. ... 449R ================================================================================ ADC_Keywords: Positional data; Proper motions Description: PPM North gives J2000 positions and proper motions of 181,731 stars north of -2.5 degrees declination. ... The mean epoch is near 1931. ...