This spherical panorama was made over the course of 24 hours by Chris Kotsiopoulos, showing an entire Athenian day in one single picture, with 500 star trails, 35 sun images and 25 landscapes. Here's how he did it:
I began the shooting the morning of December 30, 2010, taking photos with my camera on a tripod facing east. The day portion of this shoot is composed of a dozen shots covering the landscape from east to west as well as the Sun's course across the sky, from sunrise to sunset. I recorded the Sun's position exactly every 15 minutes using an intervalometer, with an astrosolar filter adjusted to the camera lens. In one of the shots, when the Sun was near its maximum altitude, I removed the filter in order to capture a more dramatic shot that showed the Sun's "glare."
After sunset, I took various shots with the camera facing west-northwest in order to achieve a more smooth transition from the day portion to the night portion of the image. The night portion is also composed of a dozen landscape shots but this time from west to east. After the transition" shots, I took a short star trail sequence of approximately half an hour duration, with the camera facing northwest. At 7:30, I turned the camera to the north and started taking the "all-night" star trail shots — lasting almost 11 hours. After accomplishing this, I then turned the camera to northeast and shot another short half an hour star trail sequence, and then finally, with the camera now facing east-northeast, I took a series of night-to-day transition shots.