Happy Birthday - 6 Years Blogging

My first blog was published on December 23, 2012. So, today, time to celebrate 6 years of blogging.
Congratulations :)

The Solar System Barycenter

The Barycenter of our Solar System is the mutual center of mass of the total Solar System with the Sun and all it's Planets. 

So the Sun and the Planets orbit this mutual center. This center or Barycenter of our Solar System moves depending the position of the planets. The location of the Barycenter is mainly driven by Jupiter and next by Saturnus, Uranus, ...

Sometimes the Barycenter is located within "the Sun" but as it is currently, the Narycenter is located outise the photosphere of the Sun. See picture above - the Sun is drawn in Yellow.

For more information see this website.

WOW Double Pinhole Solargraph June-December 2018

Today I opened my DIY Pinhole Camera after being outside for exactly 6 months. This time I made two holes in my pinhole camera making it a bit more creative. I'm really satisfied of  my result. The solargraph is very sharp and the double hole makes it even more special. I think this Solargraph is one of a kind :)
The pinhole camera was installaed in my garden with a southview on my tree.

Time to install your pinhole camera for a Solargraph - DIY Solargraphy

Last day to prepare for your Solargraph. This date is perfect to install your Solargraph and keep it outside untill June 21, 2019.

How to make a pinhole camera for a Solargraph? See instruction noted in my blogpage, both English as Dutch.

Start Astronomical Winter

In the northern hemisphere the astronomical winter will start at exactly 23h23 local time (UT22h23).

Fix the date 23 january 2019 : Sir Roger Penrose

On Jan 23, 2019, Sir Roger Penrose will give a lecture as part of Studium Generale at Maastricht University. I made already a big circle in my agenda for this unique event.

Bathtinov Mask

For the first time I used a Bathinov Mask (in loan from Walter) to focus my telescope accurately. Putting the mask in front of my telescope and then pointing the scope on a bright star will show spikes. When the central spike is centred between the two outer ones, the system is focus.