... Bad Astronomy . ... Bad Astronomy : The Moon appears larger on the horizon than overhead because you are comparing it to foreground objects. Good astronomy : The Moon does appear larger on the horizon, but it is because of the way we perceive the sky. ... The most common misconception is that it is because you are unconsciously comparing the Moon to foreground objects like trees and houses, or even the horizon itself, and that makes the Moon look bigger than when it is all alone in the sky. ...

Next: stecf.impol - an IRAF Up: The ``stecf" IRAF Layered Previous: stecf.nictools - NICMOS GRISM . Slitless is an IRAF task originally written to allow the ``quicklook" extraction of spectra from STIS direct/grism HST image pairs. ... Optionally, a Data Quality image extension can be used to avoid extracting flagged pixels. Slitless is configured to work primarily with the STIS G750L grism mode, but more modes can be defined by the user using a simple grism dispersion configuration file. ...

... Here we will continue to look at line plots. ... Handling Missing or Bad Data in Line Plots . ... IDL has a number of ways to position line plots and other IDL graphical displays in the display window. ... In IDL, the !P.Multi system variable can be used to create multiple plots in a display window. ... P.Multi(0) . ... IDL> plot, num, line, linestyle=0 . ... IDL> badData = line . ... IDL> plot, badData . ... IDL> Plot, badData, Max_Value = 1.0 . This ends the "Beginner's IDL - Line Plots Series." ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. October 20, 1997 . Spiral Eddies On Planet Earth . Credit: STS 41G Crew , NASA . ... Looking like a twisting cloud of gas and dust between the stars this wispy nebulosity is actually close by - a spiral eddy formed near the North Atlantic Gulf Stream off the East coast of the US. ... About APOD > . ... NASA Technical Rep.: ...

... Spiral Eddies On Planet Earth . ... Credit: STS 41G Crew , NASA Explanation: Can you identify this stellar nebula ? How many light-years from Earth did you say? ... Imaged by the Challenger space shuttle crew during the STS 41G mission this eddy is dramatically visible due to the low sun angle and strong reflection of sunlight. ... Publications with keywords: Earth - ocean - space shuttle . Publications with words: Earth - ocean - space shuttle . ... Earth at Twilight . ...

Looking back on the universeтАЩs history for a specific patch of the sky observed by Herschel and Keck to reveal many previously unseen starburst galaxies. This graphic shows a representation of the distribution of nearly 300 galaxies in one 1.4 x 1.4 degree field of view. In total, Keck identified 767 galaxies found by Herschel. Five starburst galaxies (as seen by the ESA/NASA Hubble Space Telescope) are shown as insets. ...

. NetMAX makes several products, a firewall, a webserver, file server and "Linux Professional" based on Linux (and another series based on FreeBSD). They're sending me a copy of the firewall product so expect some info as soon as it arrives. The boxes look pretty though. http://www.netmax.com/ . Back . Written by Kurt Seifried

... Most of the time large telescopes are collecting light for a spectrograph, which spreads the light out into a rainbow. ... Atoms in the cool outer layers of a star absorb light coming from the hotter regions within, producing dark absorption lines across the spectrum. ... And astronomers do not actually use color film to take a color picture of the spectrum, for several reasons: . ... Color film does a very poor job of representing the continuous range of colors in a spectrum. ... Tutorial: Part 1 |...

... weather conditions . where to look . common halos . ... single crystals . ... ice clouds . windblown crystals . ... ray paths, 60deg and 90deg prisms (how we get 90deg refractions in ice)) . crystal orientations . ... history of simulating halos . ... examples . ... Unususal crystal orientations . Unusual crystal forms . ... I know there is some work on crystal collection from aircraft and attempts to make model (non-ice) crystals. ... Graphic of crystal types: example . ...

... Donate to Support Science Literacy . ... 2016 Annual Awards . The ASP is accepting nominations for the organizationтАЩs national annual awards which recognize special achievements in astronomy research, technology, education, and public outreach. ... Shop the AstroShop . ... The Astronomical Society of the Pacific (ASP) is accepting nominations for the organizationтАЩs national annual awards which recognize special achievements in astronomy research, technology, education, and public outreach.. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Aurora . ... Corona . Fireballs . ... Zodiacal Light . ... The first thing to do is get acquainted with what the night sky looks like. ... The National Schools Observatory web site has very good horizon views of the sky for the current night. ... If the object is moving slowly across the sky then it may be one of the larger satellites. ... Cloudbait Observatory - October 2002 . ... October 2003 Aurora at Armagh . ...

... In spite of the good potential possibilities, some of the station "Dnepr" design characteristics did not allow us to apply the usual special IS radar measurement methods. ... Thus for IS signal measurements at the "Dnepr" station, we have developed special methods for recording and processing IS signals in order to determine plasma ionospheric parameters. ... Equations (4-5) from the basis for data post processing to obtain ionosphere parameters. ...

HEK: Heliophysics Events Knowledgebase http://helioviewer.org http://www.lmsal.com/hek HER: Events Registry HCR: Coverage Registry http://www.lmsal.com/isolsearch Astro 193 : 2015-jan-26 : VLK See latest image of Sun taken with SDO/AIA using helioviewer HEK lists events and regions of interest on the Sun. ... Look at specific items using isolsearch, e.g., find a flare, look at its movie, download the data for detailed analysis. Flares on EV Lac Huenemoerder et al. ...

... Each is linked to 3-6 detailed files, telling a more complete story, and those in turn may have other links, including history sections which tell about the related history. ... Each is linked to either the next item in sequence, or else to the related historical overview. ... You can also link here to a self-contained overview of the early history of magnetism...note that links to all files are given in their proper order on the home page, linked here and also at the end of any "Exploration" file. ...

Lecture 15 Plan for Lecture Will complete derivation of Angular Diameter Distance and then go through a specific example-- Einstein de Sitter universe Then look at what it becomes in a ` flat ' universe (currently favoured) Then discuss velocities and the Hubble Law (actually derive this) And then specific examples of what the data on Luminosity distance seems to be saying about the dynamics of the universe Finally, a new topic -- horizons, in ... Also, k = 0 (for EdS) S () . ...

... a) As source material for the high-school or college curriculum, especially in physics. astronomy and their history. (b) As a source of supplemental projects by high school students or by undergraduates. (c) As material for independent studies, In particular by motivated students who seek to know more about space . ... Those wishing to look up specific topics are advised to use the index file, accessible from the end of any "Exploration" file. ... files not listed and at other resource material. ...

This module provides for determining the MIME type of a file by looking at a few bytes of its contents. ... string . ... belong . ... For example, this can recognize gzipped files and set the encoding for them. # gzip (GNU zip, not to be confused with [Info-ZIP/PKWARE] zip archiver) 0 string \037\213 application/octet-stream x-gzip This module is not for every system. ... When compiling an Apache server, this module should be at or near the top of the list of modules in the Configuration file. ...

... How to use the NAIC Staff Finder: . Select which option to use for your search (only one selection required) . Enter (last name) or (first name) to look for a specific person, Press "Go" . Or select (Dept) and choose from list to see complete staff group, Press "Go" . Or click on select "complete staff directory" to see all staff . ... Visitor Center - 346 . ... Last Name: . First Name: . Department: . ... Complete staff directory . Printable Staff Directory . ...

Thursday, April 2, 2015 Tech o con Discussion Attending: Alaina, Mark, Bill, Joe, John Wilson, Fritz, Suzanne, Conor, Alysha - STA sent the test report of our detector. ... Overall, Joe is happy with the results. ... We will do our own full-well and linearity tests, up to 65,000 counts. Can we ask them to test up to 65,000 counts? ... Open the dewar, take everything out, remove old chip, insert new chip. ... All done in the clean room. ... Joe will ask Connie and Jim. ...

... Spectrum 2 is a new quick-look applet for spectra. ... Prior to display the ESO Fits Translation Utility (FTU) is used to homogenize plots of data from HST instruments STIS, FOS and GHRS. ... Figure 1 shows Spectrum 2 in context of the ST-ECF HST archive web interface ( http://archive.eso.org ). ... The applet reads the data stream using a FITS I/O package developed by McGlynn/USRA and then parses certain keywords in order to define a plot (Figure 3 ). ...