Wednesday, June 24, 2015

Solargraph 2014-2015

It's always a special and exciting moment when you open the pinholecamera. In total 6 months exposure to all kind of weather conditions : snow, rain, freezing, fog and sunny.
This time two pinhole camera's were installed with the following result.







Sunday, May 17, 2015

Beautiful sundog

This evening, low at the sky, a beautiful sundog or phantom sun could be observed.


Phantom sun with on the low-left the top of a balloon.



The sun on the right, the phantom sun on the left. 

Wednesday, May 13, 2015

Sunday, May 10, 2015

Meteorites under microscope

Helios Astronomy club was invited by one of it's members Lieven - thanks for the nice invitation. On the agenda today, observing meteorites under the microscope. Jan brought along his meteorites collection  - a mars meterorite, a iron meteorite and a rock sample impacted by a meteorite.









Tuesday, May 5, 2015

The Science behind gravitational lensing by spinning black holes


Astrophysics of the accretion disk shown around spinning black holes is explained in this movie  Gravitational lensing by spinning black holes - see also http:\\www.orionxt12.blogspot.com