Sirsalis (crater)

Sirsalis is a lunar impact crater located in the western part of the Moon's near side. It lies within the Oceanus Procellarum, to the south of the crater Grimaldi. It is named after the Italian astronomer Hieronymus Sirsalis.

Sirsalis is a relatively shallow and worn crater, with a low, rounded rim. The interior floor is relatively flat and featureless, with a few small craterlets. The crater is most notable for the prominent rille that extends from its eastern rim.

The Sirsalis Rille is a long, sinuous feature that stretches for approximately 480 kilometers across the lunar surface. It is believed to be a volcanic feature, formed by lava flows that carved a channel through the regolith. The rille begins just east of Sirsalis and trends generally towards the northeast.

Due to its location and the presence of the Sirsalis Rille, the crater Sirsalis and its surrounding area have been of interest to lunar geologists and scientists studying the Moon's volcanic history.