Refraction

Is the selenelion lunar eclipse really rare event?

by
Earth umbra pattern

In this text, I would like somewhat to continue the thread from the previous one, which has described briefly my observation of the “just” partial lunar eclipse on Monday morning of May 16th. As I mentioned there, there is a thing, which requires an explanation. The question has been asked in the title and my … Read more

5 fantastic tips & tricks for the Ulrich Deuschle panorama generator

by
Udeuschle blueness of the horizon

If you are interested in long-distance observations or simply panoramic views from some location, mainly mountain peaks or hills, you should have heard about the Ulrich Deuschle panorama generator. This is the web-based tool, which in 2010 successfully superseded its predecessor – Kashmir 3D software, which was based on simple digital elevation model (DEM) files … Read more