How to observe comet Elenin with Stellarium

How to observe the comet Elenin with Stellarium / Comment observer la comète Elenin avec Stellarium

Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.

It is being used in planetarium projectors. Just set your coordinates and go.   Source: http://www.stellarium.org/

Stellarium

From Wikipedia, the free encyclopedia

For the computer program of the same name, see Stellarium (computer program).A stellarium is a three-dimensional map of the stars, typically centered on Earth. They are common fixtures at planetariums, where they illustrate the local deep space out to perhaps 50 light years. Older examples were normally built using small colored balls or lights on support rods (painted black to make them less obvious), but more recent examples use a variety of projection techniques instead.

CNL Editor’s Note:

Go Linux!

We strongly encourage our readers to discover the fascinating world of open source. In our website, we are using essentially and totally open source software, from OS (Linux Mint) to word processing application (Open Office). Our site uses WordPress, wich  is an open source blog tool and publishing platform powered by PHP and MySQL.

Libre as in CanadaNewsLibre!

 

Generalizing the “Gratis/Libre” distinction to the Open Access movement

Extract source: en.wikipedia.org/wiki/Libre#Libre

The original Gratis/Libre distinction concerns software (i.e., code), with which users can potentially do two kinds of things: (1) access and use it and (2) modify and re-use it. “Gratis” pertains to being able to access and use the code, without a price-barrier, and “Libre” pertains to being allowed to modify and re-use the code, without a permission barrier. The target content of the Open Access movement, however, is not software but published, peer-reviewed research journal article texts.

1. Code (text) accessibility and use. For published research articles, the case for making their text accessible free for all online (Gratis) is even stronger than it is for software code, because in the case of software, some developers may wish to give their code away for free, while others may wish to sell it, whereas in the case of published research article texts, all their authors, without exception, give them away for free: None seek or get royalties or fees from their sale. On the contrary, any access-denial to potential users means loss of potential research impact (downloads, citations) for the author’s research—and researcher-authors’ employment, salary, promotion and funding depends in part on the uptake and impact of their research. So whereas not all programmers may want their software to be accessible Gratis, all researchers want their articles to be accessible Gratis.

2. Code (text) modifiability and re-use. For published research articles, the case for allowing text modification and re-use is much weaker than for software code, because, unlike software, the text of a research article is not intended for modification and re-use. (In contrast, the content of research articles is and always was intended for modification and re-use: that is how research progresses.) There are no copyright barriers to modifying, developing, building upon and re-using an author’s ideas and findings, once they have been published, as long as the author and published source are credited—but modifications to the published text are another matter. Apart from verbatim quotation, scholarly/scientific authors are not in general interested in allowing other authors to create “Mashups” of their texts. Researcher-authors are all happy to make their texts available for harvesting and indexing for search as well as data-mining, but not for re-use in altered form (without the permission of the author).

The formal analogy, and the generalization of the Gratis/Libre distinction from Open Software to Open access (publishing), have been made.[8] However, because of the substantive disanalogies regarding (1) and (2) noted above, the analogy needs to be treated with some caution.[9][10]

ↄ⃝ Copyleft CanadaNewsLibre 2011

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