「陽光軌跡攝影」(Solargraphy) 亦叫「太陽記錄法」或「日軌影像 」。簡單來說，是以最原始的「針孔成像」光學原理，拍攝太陽移動軌跡的影像。
Solargraphy 概念源自芬蘭藝術家 Tarja Trygg，計劃自2002年開始，她利用菲林筒自製小型針孔攝影機，記錄「陽光軌跡拍攝」。由於對太陽軌跡在不同緯度的展現產生了好奇，驅使她將小型針孔攝影機寄給世界各地的朋友，以求得到不同緯度下的日照軌跡相片及當地的景致。
Solargraphy is applying the technique of pinhole photography with long exposure time to record the solar track (sun path). The exposure time can vary from few weeks to years in order to capture the sun’s path on sky.
The concept of solargraphy originates from an artist called Tarja Trygg from Finland. She started to make mini-pinhole camera to record solar track since 2002. She became curious about different angles of solar tracks in different places with different attitudes.
陽光軌跡拍攝過程簡介
How to take Solargraphy photos？
Make a pinhole camera and load it with light-sensitive material: photographic paper.
Then fix it in a place for long-time exposure. (Up to 3 months to 1 year!)
After a period of exposure, dismantle the pinhole camera. Taking the photographic paper out and then scanning it. The image appears!
After scanning, open the image with Photoshop. Converting the image to positive. WOW! You can now see the sun track shown in the image.