... WFPC2 has a polarizer filter which can be used for wide-field polarimetric imaging from about 200 through 700 nm. This filter is a quad , meaning that it consists of four panes, each with the polarization angle oriented in a different direction, in steps of 45o. The panes are aligned with the edges of the pyramid, thus each pane corresponds to a chip. ... Accurate calibration of WFPC2 polarimetric data is rather complex, due to the design of both the polarizer filter and the instrument itself. ...

spaceweb@oulu.fi - last update: 1 July 1998, 1200 UT (RR) . ... Relates the wave number k to the wave frequency. ... From the equation of motion , m d v /dt = q( v x B ) one can calculate that, in a presence of magnetic field B , a charged particle is accelerated in direction perpendicular to both v (perp) and B . ... The angle a between magnetic field B and velocity vector of a charged particle, v ., i.e., sin a = v(perp) / v(total), where v(perp) refers to the velocity component perpendicular to B . ...

... 3a. Angle . of sunlight . ... The Moon (1) . ... 4b. Moon Libration . ... The apparent path of the Sun across the sky. Note how much higher the Sun is in the sky in mid-summer! ... In addition, they are invariably tilted at an angle around 45 , to make sure that the arrival of the sun's rays is as close to perpendicular as possible. ... The rays of the summer sun, high in the sky, arrive at a steep angle and heat the land much more than those of the winter sun, which hit at a shallow angle. ...

... The Figure shows the parallactic angle in relation to the source position at (RA,DEC), the zenith of the telescope at (LST,AoLatitude), the hour Angle HA, and the azimuth direction AZ (in the picture the source has already transitted). ... Now suppose that a second feed was placed 1 beam width away from the central horn parallel to the azimuth arm. ... Figure 1. shows the parallactic angle rate versus azimuth angle for declinations 8 through 28 (spaced 1 degree steps from Arecibo's latitude). ...

Name: PGQTXT Purpose: find bounding box of text string Category: GRAPHICS File: pgplot.src Author: T.J. Pearson Use: see description below. Description: SUBROUTINE PGQTXT (X, Y, ANGLE, FJUST, TEXT, XBOX, YBOX) REAL X, Y, ANGLE, FJUST CHARACTER*(*) TEXT REAL XBOX(4), YBOX(4) This routine returns a bounding box for a text string. ... Arguments: X, Y, ANGLE, FJUST, TEXT (input) : these arguments are the same as the corrresponding arguments in PGPTXT. ... XBOX(4), YBOX(4)). ...

... Meta Index / Home Page / Parameter types . Angle parameters are intended for right ascensions and declinations, where conversion from hours/minutes/seconds or degrees/minutes/seconds may be needed. ... Note that the maximum range of the angle type is [-360,360] degrees. ... xxdxxmxx[.xxx]s (degrees, minutes and seconds) xxhxxmxx[.xxx]s (hours, minutes and seconds) [(+|-)]xxx[.xxx] (decimal degrees) . ... Note: Angle parameters are accessed by the task as a real value, in degrees. ...

... Polarizer efficiency is defined as , where and are the respective measured signals for a polarizer oriented parallel and perpendicular to the axis of a fully polarized beam... angle 12.2 . Polarizer position angle as measured from the NICMOS Aperture Offset Angle of , about the aperture center toward the +U3 axis.. IDL 14.1 . IDL (Interactive Data Language) is an interactive analysis and visualization program written by Research Systems, Inc.... resolution. ...

... Forum . ... Recent Topics . ... MAO main . Info . Definition of Polarization Angle . ... От: "Claus Leitherer" . ... Тема: Definition of Polarization Angle . ... Please take note of the attached IAU recommendation concerning the definition . of the polarization angle in astronomical measurements. ... www.mao.kiev.ua/images/postbyemail/Polarization.pdf . ... Board Categories MAO main - Info - MAO - news - Flame Technical - Technical Support(Forum)(Техподдержка(Форум)) . ... MAO NASU . ...

Next: Identification loop Up: Wavelength Calibration Previous: The Echelle Relation . As a consequence of the cross-disperser dispersion relation, a given line repeated in two overlapped regions of the spectrum must be found at the same y position if spectrum and detector are perfectly aligned. ... The above condition provides a geometrical way to estimate the angle, as: , with the difference in y position of the two occurences of the pairs and the difference of their x positions. ...

... If the Earth is round, the Sun must be north of the equator in northern summer, and south of the equator in northern winter. ... From the Earth's perspective, the Sun is spiraling from north to south and back again along the ecliptic (see figure 7 ). ... The round Earth, at the summer solstice. ... If the rotation axis of the Earth is tilted with respect to its orbit, the equator bobs back and forth, causing the Sun to be north for half the year, and south for the other half (see figure 9 ). ...

... Posts tagged ?Kd-tree? ... Review papers on Bayesian hierarchical modeling and LAR (least angle regression) appeared in this week?s stat arXiv and in addition to interesting astro-ph papers. ... Comment . ... Entries RSS . ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray...

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... Still, no known cat could have created the vast Cat's Paw Nebula visible in Scorpius . At 5,500 light years distant, Cat's Paw is an emission nebula with a red color that originates from an abundance of ionized hydrogen atoms. ... Pictured above , a wide angle, deep field image of the Cat's Paw nebula was culled from the second Digitized Sky Survey . ... Publications with keywords: emission nebula . Publications with words: emission nebula . ... IC 1396: Emission Nebula in Cepheus . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2010 April 21 . Wide Angle: The Cat's Paw Nebula . ... Still, no known cat could have created the vast Cat's Paw Nebula visible in Scorpius . ... Pictured above , a wide angle, deep field image of the Cat's Paw nebula was culled from the second Digitized Sky Survey . ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

STEP INTO THE BLUE - MEADE INSTRUMENTS PRODUCT GUIDE . ... Telescopes . ... Meade Series 5000 Ultra Wide Angle 5.5mm Eyepiece (1.25") . ... Meade Series 5000 Ultra Wide Angle 5.5mm Eyepiece (1.25") #07740. Meade Series 5000 Ultra Wide Angle eyepieces offer revolutionary new advances in resolution, image correction and eye relief, with an astonishing 82 field of view and waterproof construction. ... Looking through a Meade Series 5000 UWA eyepiece is the next best thing to actually being there. ...

Chapter 11 (chapter 10 in the 2nd edition).

... Астрономический телескоп ETX-80AT-TC . ... Окуляр QX Wide Angle 30mm (2") . ... Поле зрения 70 градусов . ... Окуляр парфокален (то есть не требует перефокусировки при смене увеличения) не только с другими окулярами серии 4000QX, но и большинством других 2" окуляров от Meade и многих других производителей. ... Компактные цифровые фотоаппараты . Зеркальные цифровые фотоаппараты PENTAX . ... Окуляры PENTAX . ... Copyright PENTAR ї2004-2016. (бинокли, цифровые фотоаппараты, телескопы) . ...

... The three optical trains for the cameras, and the pupil reimaging system, are mounted on a wheel, accurately driven by an external motor. ... The low-resolution spectroscopic mode uses the wide field camera and a suitable set of grisms and order sorting filters that are inserted in the parallel beam after the pupil. ... One of the five grisms can operate at four different orders, depending on the filter selected on the first filter wheel that acts as order sorter. ...

... Early on, our interest in chirping analysis functions was motivated by a different kind of chirping phenomenon: chirping due to perspective. ... Our interest in radar, however, drew us toward processes that are more accurately analyzed by linear-FM chirplets. ... We have also constructed other chirplet transforms, such as a three-parameter Doppler chirplet representation that models a source producing a sinusoidal wave, while moving along a straight line (e.g. a train whistle). ...

Eyepieces Forum Message . ... Eyepieces ћ Meade ћ Misc. ... Eyepieces | ... Need Super Wide Angle (SWA) Eyepiece ? ... H. 2inch/32mm/6-element/80Deg.A.F. SWA eyepiece US$115 . I. 1.25inch/14~25mm/6-element/75-80Deg.A.F. SWA eyepiece US$70-90 . J. 1.25inch/6.5~40mm/4-element Plossl Eyepiece US$25~30 . ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...