Hyginus is a small lunarcrater located at the east end of the Sinus Medii. The crater rim is split by a long, linear rille that branches to the northwest and to the east-southeast for a total length of 220 kilometers. The crater is deeper than the rille, and lies at the bend where they intersect. Together the Hyginus crater and Rima Hyginus form a distinctive and prominent feature in an otherwise flat surface. Smaller craterlets can also be discerned along the length of this rille, possibly caused by a collapse of an underlying structure.
Satellite craters
By convention these features are identified on Lunar maps by placing the letter on the side of the crater mid-point that is closest to Hyginus crater.
For craters, it's the difference between the upper part of the internal slopes and the floor.
This field indicates clearly the lunar region where can be found the formation according to a more known one (sea, mountain or large crater) or according to the position on the edge of the lunar disk (limb) or according to the center of the lunar disk.
For other formations than craters, the official name is first translated in English, and then you can find the real name of the person whose name has been given to the formation.
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