... 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 . ...