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!

About Astronomy Club Toutatis

The Godlee Observatory: Manchester Astronomy Society since 1903

Godlee Observatory
on the roof of the Sackville Building
Credit: Michael Oates

As part of a trip to Manchester to visit a friend, I decided to visit the Godlee Observatory on the roof of the Sackville Building at the University of Manchester, England. 

This time I came unannounced. I found on the Internet that The Manchester Astronomical Society weekly meeting was on a Thursday, I taught: "Well, I arrive on a Thursday so I'll be there!"

The Manchester Astronomical Society founded in 1903 aim to encourage the study of astronomy for both the newcomer and the seasoned observer alike. Every Thursdays they meet in the Godlee Observatory where they present lectures on astronomy. Weather permitting you may also observe using the telescopes until as late as people want to stay.

As soon as we step into the Observatory, This typical English lad named Anthony "Tony" Cross Astronomy Outreach spokesman extraordinaire, welcomed me and my travel companion. I have to say I visited many Observatories in the World, Tony is probably my favorite Astronomy Outreach spokesman of all time. His swag ways, his competent speech and the knowledge of his astronomy is unprecedented.

The Godlee Observatory speaking to Tony
Credit: Milla Mäkilä

 As for the Godlee Observatory it is a beauty in itself. Straight  on the roof of the Sackville Building in the center of the city  at the University of Manchester, the Dome sticks out as a  tower from an other era in the midst of a newer Manchester.

 This Observatory is peculiar in 3 ways:

 1. The Grubb Dublin double telescope.

 2. The Dome is made of Papier-mâché.

 3. The founder Francis Godlee. Generous in time and money  to the less fortunate ones.



Howard Grubb and the double telescope at Godlee Observatory.
Sir Howard Grubb (1844-1931) was an optical designer from Dublin, Ireland. He was head of a family firm that made large optical telescopes, telescope drive controls and other optical instruments.
The Godlee double telescopes (made by Grubb of Dublin), which have been in regular use since 1903 are formed by an 8" refractor and a 12" Newtonian reflector.
The refractor is used mostly to view the moon and brighter objects, including the Sun projected as a 15" disk onto a screen fastened to the tailpiece. A cable link to a webcam attached to the telescope in the observatory on the floor above allows members to view the moon and brighter planets, collectively, via the digital projector.

What comes to mind when you think about Manchester. Football? Oasis? No! The weather!
The Dome of the Godlee Observatory was constructed with an unusual material. Papier-Mâché!
Papier-mâché is a sturdy material for construction, It seems to be a good idea to build a "lite" dome in this material. But the only problem is the rainy weather of the UK. It seems also that it has lasted for half a century. Since the 1950's renovations have been made to include fiberglass on the exterior of the dome.

8" Refractor Grubb Dublin @ Godlee Observatory
Manchester, England
Credit: Milla Mäkilä

The Observatory in 1903 was presented to the city of Manchester by Francis Godlee. A wealthy and generous man who love to give his time and money for the less fortunate. The Manchester cotton trade at this time was thriving, and the firm of Simpson & Godlee, cotton manufacturers and calico printers, steadily expanded. Its offices and warehouses moved to the centre of Manchester, and further mills were acquired at Bolton and at Bury. By the turn of the century, there was a workforce of some 1500 people. The firm's prosperity owed much to Francis Godlee, not only to his good business sense, but also to the sympathetic consideration he showed for his employees. He became chairman of the firm in 1914 on the death of William Simpson and continued to run the business through the difficult war years and after the war until a few years before he died.

Before I leave you with links to the Manchester Astronomical Society,  Godlee Observatory, the Grubb Dublin Telescope, Howard Grubb and Francis Godlee, I want to thank President Anthony Jennings, Marion and the Manchester Astronomical Society for their hospitality.  A special Thank to Kevin Kilburn to include Me as a speaker for their Power point presentation on our Sun. Thank you also for featuring my Gif animation of the green flash of our setting Sun I filmed last March in Tenerife, Canaria Islands. A huge Thank you  to Tony Cross for the gran tour of the Godlee Observatory. I know now where the Sun rises and where the Sun sets. Cheers!

Manchester Astronomical Society
Facebook page of the Manchester Astronomical Society

Godlee Observatory
WIKI Godlee Observatory
WIKI Howard Grubb / Grubb Dublin Telescopes
WIKI Francis Godlee

About Astronomy Club Toutatis, Kustavi, Finland

Star Talk Radio with Neil DeGrasse Tyson anyone?

A shout to you who often listen to talk radio and is into astronomy.
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Have a listen to these coherent, modern  and funny shows with special guess.
Listen to Star Talk Radio HERE 

You can also find Star Talk Radio in TuneIn for your mobile phone or tablet IOS or Android.


About Astronomy Club Toutatis