Archive - Keogram of Mt. Snezka
April 29, 2018
Photographer: Tomas Trzicky; Lukas Ronge
Summary Author: Tomas Trzicky
The image above featuring Mt. Snezka in the Czech Republic was created from 1,440 narrow, vertical strips of consecutive photographs. This is referred to as a keogram. Keograms were originally used for displaying auroras from a sequence of fisheye photos. The photo strips displayed here were taken once per minute between 00:00 and 24:00 on March 7, 2012, just one day before the full Moon. Each frame is represented by a narrow vertical strip, which progresses in time from left to right with each consecutive image. So the final image is a horizontal representation of time.
From this late winter image, taken a few days shy of the vernal equinox, it's evident that the duration of night and day was almost equal. The day dawned clear and bright and blue sky dominated the morning hours, but during the afternoon scattered clouds started to form. Night scenes are moonlit. The two apparent divisions of day and night are caused by switching between manual exposure (nighttime) and automatic exposure (daytime). In the center foreground, people at work are displayed as short dark lines. The camera is facing east, looking toward Mt. Snezka, the highest peak in the Czech Republic at 5,256 ft (1,602 m).