Posted on Thursday, February 26, 2015
By Kadri Tinn |
The Sun appears rather quiet with no large sunspots.
On the picture below the small sunspots aren't easily seen- However you can see prominences on the edge of the solar disk and dark filaments and bright plages on the disk of the Sun.

This photo was taken in Tartu, Estonia with a Coronado SolarMax II telescope and Canon EOS 500D camera. ISO 200, exposure 1/50 s.
The Sun in H-Alpha on February 26th, 2015. Image credit: Kadri Tinn

Labels: ,

Posted on Tuesday, February 24, 2015
By Kadri Tinn |
The Sun photographed in H- alpha on February 17th, 2015 in Tartu, Estonia with a Coronado SolarMax II telescope and Canon EOS 500D camera. Exposure 1/60 s, ISO 200.
The Sun in H -Alpha on February 17, 2015. Credit: Kadri Tinn

Labels: , ,

Posted on Tuesday, February 24, 2015
By Kadri Tinn |
Mechanics: An Intensive Course by Masud Chaichian, Ioan Merches, Anca Turneau

In a general physics course, mechanics is something that seems rather basic as it is one of the fundamental courses you can take to build your physics education on.
As such some basic Newtonian mechanics can be found in the first part of the book and after that the textbook covers what is known as analytical mechanics - a highly mathematical area of study that benefits from spending a lot of time working out problems and concentrating on the mathematical methods and physical applications. So the reader finds both Lagrangian and Hamiltonian formalism and the principle of least action.

The book is well structured and follows the logical way of studying mechanics with a large amount of problems that the student can solve and if you have lost yourself in the physics because of forgetting an important part of mathematics - some of the relevant topics can be found in the appendices and might help you get back on track.

It's good study material and well equipped for those who want to find out more about the applications of a analytical mechanics in addition to the general idea of it.


Posted on Tuesday, February 24, 2015
By Kadri Tinn |
Posted on Wednesday, February 18, 2015
By Kadri Tinn |
Posted on Wednesday, February 18, 2015
By Kadri Tinn |
ESA's Rosetta spacecraft has had it's closest encounter yet with the comet 67P/Churyumov-Gerasimenko getting as close as 6 kilometers from the comet's surface. Find out more in the video below:

Labels: , , ,

Posted on Friday, February 13, 2015
By Kadri Tinn |
Mathematics For Physicists and Engineers by Weltner et al.

If you've ever taken a physics class, you know how important a sufficient understanding of the underlying mathematics is.
In this mathematics textbook, you'll find possibly all the mathematics you'd need for first years of an undergraduate physics course - algebra, geometry, calculus and statistics.
You'll find the theory, proofs and examples and what I found very nice was that the examples were from physics, making the sometimes abstract seeming mathematics come more to life and you'll be able to see where and how you would use this piece of knowledge.

Of-course the book also offers exercises, which as in case of the examples, have a tinge of physics to it and because of it are more interesting to solve.

With the book there is also an online study guide designed to help the student advance quite quickly. The online study guide can be accessed either as a print version, where you can go through it chapter by chapter in pdf format, or as screen format that looks more appealing and is faster to use.
Having never used a study guide before, I found it very helpful and since it doesn't pack a lot of information or tasks in a small amount of space, it is more motivational to actually use it and go through the book and exercises and check whether you know everything you're supposed to.

If taken alone, the textbook is as any other mathematics textbook for physicists, together with the study guide it is an excellent combination, especially if you prefer to study alone from a book rather than listen to lectures and take notes there. It's strange to write it, but I loved the whole concept. I wish every textbook came with a study guide like this one.

Labels: ,

Skywatch    News    Pictures    Videos    Events    Northern Lights    NASA    ESA    ISS    Jupiter    Curiosity    Mars    Moon    Lyrids    Super Moon    Venus Transit    Book Review    Games   
Upcoming Events
Submit your Photos
Have you taken interesting photo of the night sky and would like to share it with us?
Send in your photos to below email, with as much details possible relating to the photo. has created this privacy statement in order to demonstrate our firm commitment to privacy.

Information we collect:
We may log IP addresses and/or drop cookies to prevent abuse of our website and/or to enhance services.

Third Party Advertising:
Ads appearing on this website, are delivered to you by Google Adsense and other third-party advertising companies.

Information about your visit to this site, such as number of times you have viewed an ad (but not your name, address, or other personal information), is used to serve ads to you on this site. These third parties and or may be placing and reading cookies on your browser to collect information, in the course of ads being served.

You may manage your cookies via your web browser and if you would like more information about this practice and to know your choices about not having this information used by these companies, please click here

Google, as a third party vendor, uses cookies to serve ads on your site.

Google's use of the DART cookie enables it to serve ads to your users based on their visit to your sites and other sites on the Internet.

Users may opt out of the use of the DART cookie by visiting the Google ad and content network privacy policy.

Advertisers and Third Party Cookies :
In the course of serving advertisements to this site, our third-party ad server, Google Adsense, intergi, or individual advertisers may place or recognize a unique cookie on your browser. Cookies received with banner ads are collected by our ad company, and we do not have access to this information.

External Links: contains links to other sites. is not responsible for the privacy practices or the content of such Web sites.