... The removal of the bright sky background from your IR images is one of the key steps in the data reduction process. Once bad pixels have been removed from all the astronomical frames, the object frames must have the matching sky background images subtracted from them. ... The simplest sky subtraction is where you have separate sky and object frames taken a short time apart. ... The resulting sky subtracted images should be examined to make sure that sky subtraction has been properly achieved. ...

... Actual stars are expected to be more complicated than these simulations. ... The spot may be entirely visible most of the time (one would observe a prolonged flux minimum low), and then part of it may disappear over the horizon briefly and then return (slow rise and then fall back to constant level). ... With the set of observations taken here, I have information available from several comparison stars and color information. ... The period found must be consistent with the data from any given night....

Next: Network logins Up: Major services in a Previous: Graphical user interface . Networking is the act of connecting two or more computers so that they can communicate with each other. ... Most basic services--filesystems, printing, backups, etc--can be done over the network. ... However, this book merely glances at networking; see the Linux Network Administrators' Guide for more information, including a basic description of how networks operate. ... Sun May 4 14:08:43 EEST 1997 ...

A new smart basketweave observing mode that can start and stop anywhere in a lambda depending on a given RA range of the map has been implemented. ... The track file is updated by CIMA when a smart basketweave track is observed. ... The smart basketweave will start observing at the start RA at the start LST. ... Restarting the smart basketweaving either from the observing menu or by restarting it in the command file will force CIMA to continue observing the same track. ... track number . ...

The sections <Directory> , <Location> and <Files> can contain directives which only apply to specified directories, URLs or files respectively. Also htaccess files can be used inside a directory to apply directives to that directory. ... The order of merging is: . ... If multiple <Directory> sections apply to the same directory they are processed in the configuration file order. ... Using the options in question is only possible inside a <Directory> section (or a .htaccess file). ...

Some common problems in geodesy and astrometry after establishing ICRF Victor V. Popadyov, Centre de geodesie et cartographie (CNIIGAiK) Svetlana A. Tolchel'nikova, GAO Pulkovo Distribution of duties between astrometry and geodesy · Connection between the 2 sciences was established by the plumb-line near Earth surface · Astrometry : ... E. rot., pole motion). ... Radiosources are unobservable from points of geodetic net. ...

Next: Pass band integrations Up: Fit scenarios Previous: Triple with velocity curves Contents . Fit all three masses, as well as the inclination of one of the pairs. That not any combination of orbital inclinations is allowed can be seen from the fact that the triple consists of two double-lined binaries and only one mass solution exists for a given inclination. ... Christian Hummel 2015-04-28 ...

This complicated procedure is designed to allow the the login shell to be set up to behave differently to subsequent shells. And since environment variables only need to be initialised once at login, the behaviour of other shells can be changed by setting shell variables in .cshrc which is read each time a new shell is invoked. Usually, you are are advised to set environment variables in your .login file and shell variables in your .cshrc . ...

Communications For Your Astronomy Event . Articles | ... Cheap radios, AM modulation and license free operation made this a very popular communication for mobile users like truckers, and civic minded groups like REACT International who provide volunteer radio communications for events. ... 26.9650 MHz . AM and SSB operation allowed in the US . 4.0 Watts . ... 26.9750 MHz . ... www.astronomy.net . About Astronomy Net | ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... 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. ...

Using XPA remotely ================== XPA starts by default using network communication with access control. ... Copy and append id_dsa.pub to $HOME/.ssh/authorized_keys on the system you are connecting to. ... If you are connecting from an observer's computer to a telescope computer that is not on a local area network, you may also need to change the firewall settings to enable SSH. ... The ssh command forward the port 5901 on your local computer to the same port on the telescope computer. ...

... Energy Levels . ... and Bohr's Model . ... Expansion of . Bohr's Model . ... S-7.The Sun's Energy . ... They noted that atoms like sodium were somewhat like hydrogen, since their chemical activities implied that just a single electron was involved. ... Presumably, this shifts the energies of the levels--though no one could calculate those shifts. ... In chemical elements with many electrons (like sodium), the outermost electrons could be made to jump from one energy level to another. ...