These are my recent Pin​board​.in links:

• Spaceweather​.com Time Machine

  “SOLSTICE SOLARGRAPHS: Last Decem­ber, the staff of the Philip­pus Lans­ber­gen Obser­va­tory in Mid­del­burg, the Nether­lands, invited mem­bers of the gen­eral pub­lic to join them for a solargraph-​​making party. A solar­graph is a sim­ple pin­hole cam­era made from a soda or beer can lined with a piece of pho­to­graphic paper. About a 100 cans were deployed around the obser­va­tory and, six months later, here are the results:…”
  
  solar­graph astron­omy pho­tog­ra­phy project Mak­ing

• 6-​​month pin­hole solargraph

  “Much of pin­hole pho­tog­ra­phy relates to the use of time and being cre­ative with the light from the sun, sim­i­lar won­ders to that found in astron­omy. A 6-​​month expo­sure will enable you to image the arc of the sun as it rises or sinks through­out 6 months of the year. As well as this you will get some fore­ground detail and a cam­era to look at with awe as a small hole etches its 6-​​month expo­sure from your win­dow ledge, gar­den shed, lamp post, tree etc. Being able to cap­ture a period of time far beyond our own vision is incred­i­ble enough, but even more amaz­ing is how sim­ple it is to do. The final cam­era gives an extreme wide angle of view of 160 degrees.”
  
  astron­omy pho­tog­ra­phy Mak­ing long-​​now