Keogram Rotation
Keograms are very useful to show the sky conditions of a full night in a single image.
A keogram is generated by rotating every image, extracting a single column of pixels from the center of the rotated image, and adding the column of pixels sequentially to a new image.
A rotation of 0 degrees means no rotation is performed. A positive rotation (1 to 180) will rotate the image counter clockwise [CCW]. A negative rotation (-1 to -180) will rotate the image clockwise [CW].
Using the following image as an example.
Applying a rotation of -45 degrees will rotate the image 45 degrees CW.
