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Riled Up is a journal of science, the environment, exploration, new technology, and related commentary.  Contributors include scientists, explorers, engineers, and others who provide perspectives and context not typically offered in general news circulation.  For interested readers, additional resources are included.

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Long Exposures

Long Exposures

Solarigraph from Valladolid, Spain July 2018 & May 2019 (credit: Wikipedia/Luis Salazar)


Solarigraphy, also referred to as pin-hole photography, is an alternative approach to creating a photo by using a 19th Century technique of capturing light focused on a photo-receptive surface. Images typically capture the Sun as it moves across the field-of-view over a long period of time. This solargraph shows a bi-plane sitting stationary as the Sun rose and set over a 45-day exposure through a pin-hole camera box. The gaps in the Sun's trails resulted on cloudy days.

           Bi-plane solargraph, Budapest, Hungary  (credit: NASA/Csaba Kovacs)

Solarigraphy, and other early photographic techniques, are having a renaissance with contemporary photo-sensitive materials being used in these processes. A video tutorial presents multiple examples that are now available to create these fascinating pictures. WHB

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