Solarigraphy

Lore & Background

Solarigraphy began around 2000 when Diego López Calvín, Sławomir Decyk, and Paweł Kula launched the global 'Solaris Project', a synchronized photographic work mixing art and science via the Internet. Earlier experiments in the 1990s by Polish students Paweł Kula, Przemek Jesionek, Marek Noniewicz, and Konrad Smołenski, and in the 1980s by Dominique Stroobant, had explored long exposures on photosensitive paper and registration of sun arcs.

The images show real elements invisible to the naked eye: the apparent trajectories of the sun due to Earth's rotation. Cameras are loaded with black-and-white photographic paper, and sunlight directly blackens the surface. The resulting negative is digitized and processed with software to invert and increase contrast. Colors vary depending on the light, paper, temperature, humidity, and chemical changes during exposure.

Technically, the key is photographic paper's ability to darken without development, providing the low sensitivity needed for long exposures. For exposures longer than a few hours, a pinhole is used, often in homemade cameras made from drink cans, film canisters, or plastic tubes. The camera is fixed pointing east, south, or west, and the pinhole is uncovered for the duration. The image is ephemeral and must be protected from light and scanned promptly.

Reader's Guide

Solarigraphy is notable for its extreme long exposures, up to eight years, and its ability to reveal the sun's path as a continuous record of time. The technique merges art and science, as seen in the Solaris Project, which used the Internet to coordinate participants worldwide. The images provide not only aesthetic representations but also weather information, as cloud cover leaves gaps in the sun's trails. The process is accessible, using simple materials like drink cans and photographic paper, yet yields results that have been recognized by NASA, which selected a solarigraph as Picture of the Day in 2012. The practice's legacy lies in its democratization of long-exposure photography and its unique blend of observational science, artistic expression, and digital post-processing.

Did You Know?

• Solarigraphy uses photographic paper without chemical processing.
• The Solaris Project was a global synchronized photographic work started in 2000.
• Solarigraphs can provide information about periods when the sun was hidden by clouds.

The Architecture of Time Made Visible

Solarigraphy is a photographic technique in which a fixed pinhole camera exposes a sheet of photographic paper over an extraordinarily extended period—typically around six months, though exposures can range from a few hours to well over a year. The resulting image is unlike anything a conventional photograph can produce: it renders the Sun's daily arc from dawn to dusk while simultaneously tracing its seasonal migration from north to south, or the reverse, between the solstices. Every individual light streak in the final image corresponds to a single day of exposure. Where those streaks appear broken or absent, the cause is cloud cover that blocked the Sun's light from reaching the paper. In essence, a solargraphic image is a visual calendar written entirely in sunlight, compressed into a single frame. The technique captures a dimension of time that no standard shutter speed can access, transforming the passage of months into a static, tangible record of the sky's slow choreography.

Built from Cans: The Radical Simplicity of the Method

The equipment required for solargraphy is almost absurdly minimal compared to other photographic disciplines. Practitioners frequently construct their cameras from upcycled aluminum or tin cans—empty drink containers, for instance—punched with an aperture measured in mere fractions of a millimeter. The can is sealed to be light-tight and, crucially, weatherproof enough to survive months of outdoor exposure to rain, wind, and temperature swings. Inside sits a single sheet of photographic paper, positioned to receive whatever sunlight passes through that tiny hole. The camera is then securely fixed in a location where it will not be disturbed for the entire duration of the exposure. There are no lenses, no electronics, no auto-focus systems to manage. The photographer's only active decisions are choosing the vantage point, ensuring the can remains undisturbed, and retrieving the paper at the end. This deliberate reduction of technology to its most primitive form is what allows the Sun itself to become the sole artist, painting day after day onto the waiting surface.

Quinnell's Six Months Over Bristol

One of the most celebrated examples of solargraphy is the work of photographer Justin Quinnell, whose single six-month exposure captured the Sun's trails above the Clifton Suspension Bridge. The exposure ran from 19 December 2007 to 21 June 2008, spanning the winter solstice and the summer solstice, and was displayed as part of the exhibition Slow light: 6 months over Bristol. Remarkably, the camera for this piece was constructed from nothing more than an empty drink can and a sheet of photographic paper, fixed in a position where it would remain undisturbed for the full half-year. Quinnell himself described the resulting image as capturing "a period of time beyond what we can perceive with our own vision." The photograph compresses roughly 184 days of solar movement into one still frame, each streak a single day, the seasonal sweep from the lowest winter arc to the highest summer arc rendered as a continuous band of light. It stands as a powerful demonstration that the most profound photographic statements can emerge from the simplest tools, provided the photographer is willing to surrender control to the passage of time.

The Extreme End of Long-Exposure Photography

Solargraphy occupies the far extreme of the long-exposure tradition, a family of techniques that uses extended shutter times to render the passage of time visible within a single image. In conventional long-exposure work, moving elements like clouds, vehicle lights, stars, and water are blurred or smeared while stationary subjects remain sharp, and only bright objects leave visible trails while dark ones simply vanish. A 30-minute exposure of a static scene looks identical to a split-second shot; it is the inclusion of motion that gives long-exposure images their intrigue and often their serene, otherworldly quality. Solargraphy pushes this principle to its logical terminus: instead of minutes or hours, the exposure stretches across months or even a full year. The moving element is no longer a passing car or a drifting cloud but the Sun itself, whose apparent motion is driven by Earth's rotation and its axial tilt. Where star-trail photography traces the sky's nightly rotation, solargraphy records the Sun's seasonal arc across an entire half-year, making the invisible architecture of the calendar legible in a single sheet of paper.