... Milky Way . ... Map of the Milky Way (based on data from NASA's Spitzer Space Telescope) showing its two major stellar arms and central bar. ... ТљIn written science fiction, one often encounters another navigational convention, where towards the Galactic Centre is described as т??Corewardт??, away from the Centre towards the rim of the Milky Way is т??Rimwardт??, objects in the direction of the Galaxyт??s rotation are т??Spinwardт??, while objects in the opposite direction are т??antispinwardт?? ...

... Search By Name Enter coordinates Use current location . ... Current Issue . ... Astronomy for Kids . ... Astronomy 101 . ... Eicher book signing at Northeast Astronomy Forum . Buy and sell astronomy gear April 9 . ... How much does the rotation of our planet affect weather patterns and ocean currents? ... Earth s rotation has a significant effect on our weather. ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

It is very easy to create interesting, tileable patterns using only Gimp plug-ins. ... Let's start with a small 80x80 pixel grayscale image. ... Using the rectangular selection tool, select the uppper-left group of four squares and apply *four times* a 90 degree Whirl. ... Why four times a 90 degree Whirl, and not just once a 360 degree one? ... Now you can either do the same thing for the two lower groups of four squares (in the opposite whirl directions relative to the top groups), or use cut . ...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

... Exposure Time Calculator (ETC) . Survey processing . ... VISTA is a 4-m class wide field survey telescope for the southern hemisphere, equipped with a near infrared camera (1.65 degree diameter field of view at VISTA's nominal pixel size) containing 67 million pixels of mean size 0.34 arcsec and available broad band filters at Z,Y,J,H,K s and a narrow band filter at 1.18 micron. A wide field visible camera, if constructed, could also be used on VISTA. ... Tile . ... ESO VISTA Public Surveys . ...

Beginning from the May of the 1997 we started to publish our daily solar radio observations at RATAN-600 radiotelescope. ... Periscope System: South Sector+Flat Mirror . ... It is possible to track a source by moving the secondary mirror along the arc-shaped railway tracks or to perform azimuthal 2D map synthesis . ... 1) It is possible to simultaneously carry out independent observing programs using individual sectors at various discrete azimuths and secondary mirrors on corresponding railway tracks. ...

... Gallery . ... Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: Cable wrap . Description: Allows for 270 degrees rotation in either direction. Image: Dione Smith . ... Cable wrap Allows for 270 degrees rotation in either direction. ... Powered by Gallery 3.0.9 (Chartres) . ...

Winer Observatory P.O. Box 797, Sonoita, Arizona 85637-0797, USA . ... Outreach . Projects . ... Science . ... Participating in Project ASTRO, a national program to assist teachers in grades 4 through 12 in teaching astronomy . ... June, 1990: National Optical Astronomy Observatory, Friday Science Lunch Talks: "Engineering Big Science Projects" . ... May 4, 2007: National Optical Astronomy Observatory, Friday Science Lunch Talks: "The Ohio State University KELT Telescope -- Early Results" . ...

We have designed the laboratory model of static Fourier spectrometer for onboard usage for spectral study of atmosphere and ionosphere. The gain of model is to simulate onboard FS which will not have any moving elements (all its optical elements will be mounted at fused quartz monolithic construction), to compare experimental results with theoretical estimations and to measure MTF of CCD array. ... This fact connected with low frequency response of CCD array due to small format of it. ...

... In the above example, the second region uses the global coordinate system (PHYSICAL by default). ... Supported systems include: name description ---- ----------- PHYSICAL pixel coords of original file using LTM/LTV IMAGE pixel coords of current file FK4, B1950 sky coordinate systems FK5, J2000 sky coordinate systems GALACTIC sky coordinate systems ECLIPTIC sky coordinate systems ICRS currently same as J2000 LINEAR linear wcs as defined in file In addition, two mosaic coordinate ...

... The described algorithm is suitable for measurements of complex images of stars. ... a) the zero-based number of stars in the complex (multicentric) image, . b) set of preliminary coordinates - x i , y i , for all stars, index i is number of a star, . ... i - index of a star in the complex image; . ... These parameters are calculated by a nonlinear method of a least squares.The main output parameters of this algorithm are x i , y i ; where the index i is number of a star in the multicentric image. ...

... Returns UT1 in seconds, with UTC input in seconds. ut12gst ( utc _real [, ut1 _real ]) Function. Returns GST in hours, inputs are in seconds. hourangle ( gst _real , ra _real ) Function. Return hourangle in hours, with inputs also in hours. zenithangle ( ha _real , dec _real ) Function. Return zenithangle in degrees with inputs ha in hours and dec in degrees. mirrorangle ( ha _real , dec _real ) Function. ... Return horizon coordinates for input azimuth and elevation angle in degrees. ...

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

Trudy GAISH, vol. LXV, 1996 . Abstracts . The global distribution of average (5 O x 5 O ) depths . of Mohorovicic discontinuity on the Earth . ... Such analysis allows detecting whether the sources of the largest anomalies reside within the Earth's core. This is possible if the limit depths of the sources exceed the depths of the core-mantle boundary. ... by Pasinok S.L. Influence of the Earth’s cover on the polar free oscillation of the Earth’s inner core is considered. ...

... Parameters of the Moon-perturbed orbit . ... From orbits consistent with this limitation and with the date of the launch October 1, 2000 as an example, an orbit was selected with apogee directed to the North Galactic pole at the begining and rotation of orbit plane was maximized. The initial state vector is given in the inertial coordinate system in epoch J2000.0. ... The orbit has initial perigee radius Rp=7000.0 km, initial apogee radius Ra=343000.0 km and initial period T=8.453 days. ...

... What is necessary for the CPR search is a distant source of polarized radiation for which the polarization angle at the emission can be safely predicted and then compared with the observed one. ... Table 1: A summary of CPR searches Experiment R R R R C C C C C CPR angle Бstat (Бsyst) Frequency or Distance 3.6 cm ~1300Х ~3000Х ~1300Х 145 GHz 100-150 GHz 100-150 GHz 23-94 GHz 95-150 GHz <z>=0.78 <z>=2.80 z=0.811 <z>=2.80 z~1100 z~1100 z~1100 z~1100 z~1100 Direction Reference esolved RG radio pol. ...

D. Suprunenko Institute of Mathematics, National Academy of Sciences of Belarus Minsk, Belarus suprunenko@im.bas-net.by Lower estimates for the maximal weight multiplicities in irreducible representations of the classical algebraic groups The goal of this talk is to discuss some results on lower estimates for the maximal weight multiplicities in irreducible representations of the classical algebraic ... For groups of type An the situation is substantially more difficult. ...

... Using my little fractal asteroid generator I thought it would be fun to vbuild a hypothtical asteroid and see what kind of rotational lightcurves it would produce. There are a lot of free variables here - asteroid rotation axis, illumination direction and then there's a whole slew of surface properties which I could look at.... anyway here' a few examples... 0 degrees . ... 135 Degrees . ... All these angles are taken with respect to the viewer, and in the plane of the object's rotation. ...

... To set the coordinates in E2000 use xpaset -p tel target [ra] [dec] All commands and arguments are lower case. ... Primary functions set or get values and provide basic control with the actions noted tel status [exit/on/off] manage xpatel and the telescope controller tel goto [on/off] go to target tel track [on/off] toggle track on and off tel guide [on/off] toggle precision guide on target tel target [#] [#] target coordinates [RA (h)] [ Dec (deg)] (E2000) tel ...

... Spherical aberration, coma, and astigmatism are also easily observed using the star test. ... Off-axis images are complex. ... Fig. ... Diffraction by a circular aperture as a function of defocus for no aberration Airy Disk 1 wave defocus Less than 1 wave defocus Fig. ... Diffraction by a circular aperture as a function of defocus for third-order spherical aberration Paraxial Focus Small distance inside paraxial focus Moderate distance from marginal focus Immediate neighborhood of marginal focus Fig...