31 August 2014

Solargraphy! The art of Pinhole camera and long exposure photography.

2 Pinhole camera set at the same time at 60 km a part.
Solargraphy is a technique in which a fixed pinhole camera is used to expose photographic paper for an extremely long amount of time (in this case half a year). It is most often used to show the path taken by the sun across the sky, I call these lines in this post arc lines.

The picture on the left is of two Pinhole cameras pictures with 6  months exposure each. From 21.12.2013-21.06.2014. I had installed 1 Pinhole camera facing South on my home balcony in Turku, Finland and the other was at our Astronomy club's 
balcony in Kustavi, Finland (also facing South). These two locations are 60 km from each other, but are almost on the same latitude (60"N).

What you see on the pictures are the "arc lines" of our Sun. These arc lines are the Sun moving in the sky on each day. The Low arc lines represent Winter time and the higher arc lines represents Summer. The arc line start ( Sun rising) at the left of the picture and finishes at the right of the picture (Sun setting) Everything in between are the other Seasons.
Every "arc line" is 1 day of the 6 months exposure. Sometimes the arc line is cut or scuffled, this means that it was a cloudy day and the Sky was covered.
Have you noticed the dark thick gap between the lower arc lines and the higher arc lines? That is Spring with all its turmoil and cloudy days up to Summer. 

This post is linked to my 2013 Solargraph pinhole camera project.
Have a look at the post: Astronomy club's 6 months Pinhole Solargraph revealed. Great experience!

Here are cool links on Pinhole Cameras/ Solargraphy that you can do at home by yourself or with family and friends.

EAAE (European Association for Astronomy Education) Sunrise Project.
Link to Simple explanation to do a soda can pinhole camera 
Justin Quinnell video on soda can pinhole camera. Check it out!