Position measurement on twice or once exposured transit photographs
U. Backhaus, University of Duisburg-Essen, Germany

This program makes it possible to measure sizes and positions of the Sun and the planet.  Thereto, a circle can
be adjusted to the respective picture. The picture file must be in the uncompressed Windows bitmap format (.bmp)
or in the jpg-format (.jpg or .jpeg).
Operation: - Cursor keys: shift of the circle,
           -   Page keys:   change of the radius of the circle,
           -    "Return":   confirmation of the result,
           -        "F1":   additional operation hints.
In case of a single exposured picture, the angle between the directions to west and to right can be choosen,
in case of twice exposured pictures, the program determines the reference direction autonomously and, if the
declination of the Sun is known, additionally the angular radius of the Sun.
If more than one picture due to the same observation site is available they may be evaluated without leaving the
program. The measured pixel positions and radii are saved in a result file.

