... 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). ...

... Tonight's Sky . ... Sky this Month . ... The Sky This Week: April 1 - 10 . ... Astronomy for Kids . ... The Real Reality Show: Would aliens be anything like us? ... The Real Reality Show: All about the Drake Equation . ... The Real Reality Show . ... The Real Reality Show: Is Interstellar Travel Really Possible? ... Only registered members of Astronomy.com are allowed to comment on this article. ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email...

... The First Explorer . ... The cylindrical 30 pound satellite was launched (above) as the fourth stage of a Jupiter-C rocket (a modified US Army Redstone ballistic missile) and achieved orbit on January 31, 1958. ... Fighting the glow of the setting sun and the city lights of Cape Town, South Africa, comet Hale-Bopp is just visible near the center of this panoramic view - photographed on May 3rd. Hale-Bopp's Fickle Ion Tail . ... Lightning on Jupiter . ... Apollo 15's Home on the Moon . ...

. ___________________________________________________________________ The Electronic Universe Project e-mail: nuts@moo.uoregon.edu

... December 12, 1998 . Driving To The Sun . ... Explanation: How long would it take to drive to the Sun? ... Let's see ... the Sun is 93 million miles away . So, if we drove 93 miles per hour the trip would only take us 1 million hours." ... One hundred years would be 876,000 hours, still a little short of the 1 million hour drive time -- so the Sun is really quite far away . ... You've got to be impressed by something that's 93 million miles away and still hurts your eyes when you look at it ! ...

SKA-3 instrument consists of two energy-angle ( EA ) electrostatic analyzers and two energy-mass ( EM ) time-of-flight analyzers. ... Here you can find more details about SKA-3 instrumentation set. ... Case 218 . ... satellite's trajectory in geomagnetic frame ( blue coloured), UFSIPS scan location and observation moment ( red coloured), interval of the SKA-3 observations ( green coloured) . ... a view of the Nothern polar region at the moment of UFSIPS observations, the scan location is red coloured. ...

Next: The Quasi--Newton Method. Up: Outline of the Previous: The Newton--Raphson Method. ... At each iteration, one computes . ... Neglecting the second derivatives matrix , we obtain the ``normal equations'' and the Gauss--Newton direction . This so--called Gauss--Newton method is intended for problems where is small. ... The algorithm implemented here is a modification of that Gauss--Newton method, that allows convergence even for rank deficient Jacobians or for large residuals. ...

... December 29, 1997 . The Milky Way in Infrared . Credit: The COBE Project , DIRBE , NASA . ... Until the invention of the telescope , nobody really knew what the "Milky Way" was. About 300 years ago telescopes caused a startling revelation: the Milky Way was made of stars . Only 70 years ago, more powerful telescopes brought the further revelation that the Milky Way is only one galaxy among many. Now telescopes in space allow yet deeper understanding. ... About APOD > . ...

... Bad Astronomy . Misconceptions . ... Site Info . ... This page is basically a list of links to websites that either support or refute the claim that NASA never sent men to the Moon. I have my own detailed rebuttal of the Fox television program ``Conspiracy Theory: Did We Land On The Moon?'' in my Bad TV section . ... I plan on having a thorough debunking of this on this site eventually. ... Below are listed pages by both the conspiracy theorists and the debunkers. ... 2008 Phil Plait. ...

... new event list file with an EVENTS extension with a different number of rows and modified/additional items: . modified columns RAWX , RAWY (for PRODUCT: EPIC event list) . new INTEGER*2 columns DETX , DETY (0.05'') (for attcalc and PRODUCT: EPIC event list) . new REAL*8 column TIME (s) (for PRODUCT: EPIC event list) . new INTEGER*2 column FLAG (for emenergy ) . ... INTEGER*2 column RAWX giving the row (if OFFSETY >0) or column (if OFFSETX >0) of the bad offset . ...

. As you probably have seen, the star in my original image is not nova. When I looked images from others, I noticed, that the star which i marked for nova in my image, is really a very faint doublestar. After more processing for my original image and compared it with Lick Observatory discovery image the real nova is now excatly in the right place. (Sept 4th, 1998) Marko Moilanen . Back to Supernovae in NGC and IC galaxies. David Bishop Last modified: Thu Sep 10 09:27:24 EDT 1998

TURNING JAPANESE as recorded by The Vapors I've got your picture Of me and you You wrote I love you I love you too I sit there staring and there's nothing else to do Oh it's in color Your hair is brown Your eyes are hazel And soft as clouds I often kiss you when there's no one else around I've got your picture , I've got your picture I'd like a million of you over myself I asked the doctor to take your ...

The selection of the quietest days (Q-days) and most disturbed days (D-days) of each month is deduced from the Kp indices on the basis of three criteria for each day: . ... In order to indicate such a situation, selected days which do not satisfy certain absolute criteria are marked as follows. ... A selected disturbed day is considered not really disturbed and marked by an asterisk ( * ) if Ap less than 20. ... January 2000 - recent . January 1990 - December 1999 . ...

... Science . ... Science Users Information > Science and Technical Meetings > Conferences 2012 > Real Time Control for Adaptive Optics Workshop . ... ESO Data . ... The 3 rd Edition of the Real Time Control for Adaptive Optics Workshop is scheduled for spring 2014. The real-time control system (RTCS) is a crucial component for any astronomical adaptive optics (AO) system. ... As such, the workshop is aimed at real-time control specialists, instrument scientists and adaptive optics engineers. ...

The mjd keyword is used to handle the time dependent sensitivity of certain instrument detectors. ... To use this capability in simulations, include the string mjd#ddddd in your obsmode specification, where ddddd is the desired MJD value (which can be given as either an integer or real value). For example, to get the efficiency on MJD 49486, use " mjd#49486 " as part of your obsmode string. ... The default is to use the latest set of throughput values without any extrapolation. ...

Astronomy Discussion Forums . ... What Really Exists Outside The Universe . ... Post Message | ... Picture a bowl of marbles. ... Each of the spheres in your marble bowl represents a single universe. Now in reality these marble spheres exist infinitly in numbers and are not limited to some sort of cosmic bowl. ... 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" . ...

... The Hubble Space Telescope is jointly run as a partnership between the European Space Agency and NASA. ... For more information on the European contribution to the Hubble Space Telescope go to: http://hubble.esa.int and for more on the VLT go to: http://www.eso.org . ... A Taste of Real Astronomy ? The ESA/ESO Astronomy Exercises . ... The "ESA/ESO Astronomy Exercise Series" has just been published, on the web and in print. ... The language for the ESA/ESO Astronomy Exercise Series is English. ...

The following general subroutines belong to the category MATH: . ... Evaluate Bessel function J, Y, I, K of integer order. ( bessel.c ) . ... Evaluate Modified Bessel function of integer order. ( bessel.c ) . ... Evaluate Bessel function of first kind of integer order. ( bessel.c ) . ... Evaluate Bessel function second kind and of integer order. ( bessel.c ) . ... Indexes an integer array in ascending order. ( rank.c ) . ... Indexes an integer array in descending order. ( rank.c ) . ...

The software available here is only available on an "as-is" basis. ... If you use this software, and it breaks your camera it is not my fault. First, there was QVplay . ... My first qv-300 webcam used this software, and a perl script that I put together. ... Note that the perl script had to be set up to copy the file to the web server, because NFS can't be trusted to update file modification times in a timely fashion. ... Beau software also sells webcam software for the QV cameras. ...

Appendix B. The SPIcam routine, m2test . ... modified from dofocus. macro m2test . ... echo "USAGE: m2test <start> <initial focus step> <number of exp. pairs>" . break . end . if ($EXPTIME > 30) . echo "exposure time is $EXPTIME" . ... echo "too short to be reliable" . ... focus = $1 . ... npairs = $3 . findex = 0 . ... focus = $focus - $findex * $step . echo doing focus = $focus (exp. ... focus $focus . findex = $findex + 1 . ... comment "m2test $1 $step $npairs" . ...