They are computed and despatched by Alfred Kruijshoop in Melbourne. For a more complete description of the quantities on the first page click here . For a more complete description of the predicted profile first click here , and then for updated information click here .
North is always to the top, and south always to the bottom.
The shadow of the mountains shown in the profile sweeps across the Earth as the graze takes place. By combining their differing timings you should later be able to build up a complete picture of the shape of the lunar mountains at the position of the graze. The information in the lunar limb profile is based on data compiled by C.B. Watts of the U.S. Naval Observatory in the 1950s. It was Watts' life work to micrometrically measure the height of mountains on the edge of the Moon from thousands of photographs taken at different position angles, and at different librations. This was a mammoth task, as the irregularities on the moon's limb as seen from Earth are exceedingly small.