Simpelius is an
impact crater
An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact crater ...
that lies in the southern part of the
Moon
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width ...
. It lies to the north-northwest of the somewhat larger crater
Schomberger, and east-southeast of the prominent
Moretus Moretus (Moerentorf) is a FlemishAccording to the Drukkunstmuseum Maastricht (nl), the surname ''Moretus'' is the latinized form of the Flemish surname ''Moerentorf'' (Hoogdruktechniek - Plantijn & Moretus: "Na zijn dood zou het bedrijf worden vo ...
.
The most distinctive aspect of this crater is the asymmetry of the inner wall, with the side being nearly twice as wide at the southern end as it is to the north. As a result, the level interior floor is offset to the north of the crater interior. The rim and inner wall are less sharply defined than those of Schomberger or Moretus, having been softened and smoothed by impacts. The rim is uneven, with peaks to the north, west, east, and south-southeast, and low sections in between. There are also a number of small crater pits along the inner wall and the interior floor.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Simpelius.
References
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Impact craters on the Moon