Schickard [444 S 546 W Wargentin [496 S 602 W and Schiller [518 S 400 W

I have grouped Schickard and Wargentin (Figure 10.13) and Schiller (Figure 10.14) together as they are all within a 6 arc-minute diameter circle near the sSw limb of the Moon and all of them are large and fascinating craters. Being so far from the center of the lunar disc, as viewed from Earth, all these craters appear highly foreshortened. Schickard is a monstrous crater: at 227 kilometers in diameter it is not much smaller than Clavius. However, the crater floor is far less detailed and appears relatively smooth, with two shades of "lunar gray" to it: gray and darker

Figure 10.13. A photograph taken on February14, 1984, with Ilford XP1 400 film and a 36-cm Cassegrain working at f/70. The huge crater Schickard dominates this region with Nasmyth and Phocylides also shown. Above Schickard the lava-filled crater Wargentin is visible. Photograph: M. Mobberley.
Figure 10.14. The long, thin crater Schiller. An extraordinary image taken on April 21, 2005, from Barbados, with a Lumenera video camera and a 235mm Celestron 9.25. Image: Damian Peach.

gray! However, the smooth dark floor makes it a highly distinctive feature. To the south of Schickard is a most unusual crater. In fact it does not resemble a crater at all, because the interior has been filled to the very brim with lava at some stage, making Wargentin look more like a raised smooth coin, or lozenge, stuck to the lunar surface. Wargentin is 84 kilometers across and the flat top is not totally featureless as it has a few "wrinkle ridges" radiating from the center. Wargentin itself butts up to the large overlapping craters Phocylides and Nasmyth. A few hundred kilometers to the southeast of Wargentin is one of the most distinctive large craters on the lunar surface. The crater Schiller is a highly elongated crater measuring 179 x 71 kilometres. Its long, thin shape is exaggerated further by its proximity to the lunar limb. At its northwestern end the crater floor has some distinctive mountains, although the rest of the floor looks relatively flat. Personally, I always think Schiller sounds like a long thin name and it's a name that suits this formation perfectly! The figure of Schiller by Damian Peach must be one of the finest earth-based pictures ever taken.

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