. Next: How Ceilidh worksCeilidh Course Notes, User Up: Ceilidh - On Line C Tutoring System Previous: General points . The Ceilidh system is an essential part of your learning process; learn to make good use of it. Dave.Marshall@cm.cf.ac.uk . Wed Sep 14 10:06:31 BST 1994

The aim of this section of the course is to enable you to use simple computer programs to solve a variety of common astronomical tasks. ... I have (somewhat arbitrarily) decided to use Python for this course, because it seems to be gaining popularity fast for astronomical data handling, and because some of you will have encountered it at the ATNF course. ... We've put Python (plus all relevant libraries) on the Stromlo Linux computers moron and maggot. ... Now log in to moron (or maggot). ...

... Summary of reduced ISAAC fields . ... This data release includes eight fully reduced VLT/ISAAC fields in J,H,K s bands covering 50 arcmin 2 of the GOODS region in the Chandra Deep Field South (CDFS). ... 8 ISAAC fields) . ... The 8 ISAAC fields which are part of this data release are superimposed onto a SOFI image (J+K) (part of a previous EIS data release). ... In one case (GOODS field 11/J-band), for which not enough standard stars were available, the ZP was boostrapped from previous SOFI/EIS data...

... Data Reduction Guide . ... Please note that all the instructions herein are specifically for the DIS RED chip, the same goes for the BLUE chip, just redo everything but with filenames having "b's" in them instead of "r's". Incidentally as best as I can tell the image region for the RED chip is [145:755,230:665] and for the BLUE chip it is [125:480,125:375] . ... At this point you need to load the ccdredd package. ... Oh, and the read-noise for both chips is 9.5 electrons. ...

As it was already mentioned, the idea behind File Juggler is rather simple: using CGI scripts as processing tools and WWW browser as user interface, display the structure and content of typical anonymous FTP server in a convenient, easily navigated form. ... My P5-133 spends about 0.025 ms on one file when doing linear search with simple criterion (690 ms for 27,000 files, search for substring among file names/descriptions with 70 hits). ... Let's now look whether we can handle 1,000,000 files. ...

... One of the more amusing ones is the mysterious ability to balance eggs on end at the Vernal Equinox (curiously, no such claims are made at the Autumnal Equinox). ... Every year, without fail, some TV station broadcasts a news segment showing local school children standing eggs on end on the first day of spring. ... If you can stand an egg on its end on the Spring Equinox, surely you can on the Autumnal Equinox as well! ... At any day of the year, grab a carton of eggs and try to stand each one. ...

... Listed below are questions submitted by users of "The Great Magnet, the Earth" and the answers given to them. ... In "The Exploration of the Earth's magnetosphere" on the magnetic environment of the Earth in space (a few Q duplicated here) . ... 11) Magnetic Shielding . ... 51) Can electricity be generated from the Earth's magnetic field? ... 9) Measuring Earth's magnetic field . ... 6) Reversals of the Earth's field (4 queries) . ... 42) Could generated electricity affect Earth's magnetic field? ...

... [y; passwd: 305m_adm] (to update database) ~palfa/bin/plot_pointings (to see pointings that have been done) ~palfa/bin/makeobs_ new (to generate obs for current MJD (default) or a specific value if mjd is specified at the command line) autosched.cmd written locally [and postscript file generated]; cp autosched.cmd to /share/obs4/usr/ pulsar /p2030/autosched_date.cmd; present ... Unmount existing firewire disk. umount /export/firen2 (or similar) Remove and replace with new disk. ...

Next: Problems of Fourier Up: Some Problems of Practical Previous: To Restore or . Photometry of restored images has two problems. First, many restorations are photometrically unfaithful, and you get the wrong answer. ... And of course there are situations where it is absolutely necessary to restore the image. ... We ran the lucy task that is in STSDAS, for the usual 80 iterations, and it gave the wrong answer; the ratio of the heights of the two peaks was wrong by about 10 or 20%. ...

... In any case, check pmenv.pl (at Parkes!) to make sure it will read /dev/rmt/1hn. ... Check the disk space in $PM_HOME/bdhunt to make sure that > 2.0 GB are available for the birdiehunting. ... Setup: Orion = master machine (with DLT) for reading data from tape and for doling jobs to slaves Orion = slave machine (1 processor) Perseus = slave machine (2 processors, use perseus0 and perseus1) 0) Login as "pulsar" Make sure crontab is running on each machine you want to use. Check using "crontab -l". ...

... Bojan Nikolic web pages (r. 329) . ... The order in which libraries to link to are passed to the linker is important . ... Many libraries use the GNU Autoconf/Automake build toolchain. ... Run the ./configure script, which looks for the various programs and libraries that the package needs . ... The simplest way is to run ./configure and make note of any complaints about missing programs or libraries that it reports. ... Some notes on the GNU toolchain . ... Passing options to configure . ...

... In the very first iteration, the user is required to input the true coordinates of at least two sources interactively. For this Ds9 is launched showing an image that has been accumulated from the input event list with all found sources marked through excluded circles . For each source that is to be used as a reference source the user needs to: . ... There is an alternative reference source input method available that is activated with the withrefsrclist parameter. ...

... Listed below are questions submitted by users of "The Great Magnet, the Earth" and the answers given to them. ... In "The Exploration of the Earth's magnetosphere" on the magnetic environment of the Earth in space (a few Q duplicated here) . ... 11) Magnetic Shielding . ... 51) Can electricity be generated from the Earth's magnetic field? ... 9) Measuring Earth's magnetic field . ... 6) Reversals of the Earth's field (4 queries) . ... 42) Could generated electricity affect Earth's magnetic field? ...

XPA supports host-based access control for each XPA access point. You can enable/disable access control using the XPA_ACL environment variable. ... See XPA Access Points and Templates for more information about xpa templates. ... For example: xpaset -p xpa1 -acl "somehost -" will turn off all access control for somehost to the xpa1 access point, while: xpaset -p XPA:xpa1 -acl "beberly gs" will give beberly xpaget and xpaset access to the access point whose class is XPA and whose name is xpa1. ...

Previous Next Table of Contents . Increasing the Threshold value will have dramatic effects on the time it takes to process and image. ... Increases in Flare Intensity and Spike Points will also significantly increase processing time, although probably not as much so as the increase in Threshold. Changing the Spike Color from white to either background or foreground will increase the time to process the image, but the increase is not significant. ...

... SET/IRSPEC flat=.. ... SKYSUB/IRS . ... However, in SKYSUB/IRS you can avoid caring about the dark if -- and only if -- you use this command to make a straight subtraction (see last example of TUTORIAL/SKYSUB), in which case the dark frame is effectively not used. ... SKYSUB/IRSPEC . ... When using this mode remember to apply -- using the above command -- the same calibration to the object and to the standard otherwise you will not be able to run FLUX/IRSPEC. ... RECTIFY/IRSPEC . ... STANDARD/IRSPEC...

... About ATMoB . ... The ATMoB has established an email list server with various mailing lists for use by our members. ... This list has been established for use by ATMoB members, friends of members, and anyone interested in astronomy with a focus on things of interest to those in the greater Boston area. ... Notice: The owners of this server, the Amateur Telescope Makers of Boston, and any other sentient beings that happen to be involved assume no responsibility for any messages posted via this system...

You Can Make Stellar Images Brighter . Articles | ... A few months ago I wrote an article titled "You Can’t Make Them Brighter". So why am I now writing that you can make them brighter. ... The image of a focused star is actually a small disk called the Airy disk, named after the 19 th century scientist Sir George Airy. ... For a given aperture, a smaller Airy disk means that the light is focused to a smaller disk and is therefore brighter. ... www.astronomy.net . About Astronomy Net | ...

... Bad Astronomy . ... I think I will break from my usual format of Bad Astronomy/ Good Astronomy by saying that the way we define seasons currently is not strictly bad, but I feel (in my opinion!) that it could be better. The definition of when the seasons begin is at the moment of solstice or equinox; that is, winter (in the north) starts on December 22 nd and summer starts on June 22 nd . ... Now imagine breaking up the Sun's 46 degree up-and-down yearly swing into 1 day intervals. ...

Here are some images of Australian currency. ... Some of the notes below are printed on paper, others are printed on a thin, flexible polymer (i.e. plastic). The polymer notes are fairly new - The Australian Mint is currently in the process of replacing all paper money with polymer. ... The front design features a portrait of Queen Elizabeth II of England, who is Australia's Head of State. ... This note is printed on paper, and is due to be replaced by a newly designed polymer note in 1996. ...