|Coordinates||1. Selenographic coordinates are used to refer to locations on the surface of Earth 's Moon. 3° N, 87. 5° E|
|Eponym||Sea of William Henry Smyth|
Mare Smythii (Latin for "Sea of Smyth") is a lunar mare located along the equator on the easternmost edge of the lunar near side. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. The lunar maria (singular mare, two syllables are large dark Basaltic plains on Earth 's Moon, formed by ancient Volcanic eruptions The Smythii basin where the mare is located is of the Pre-Nectarian epoch, while the surrounding features are of the Nectarian system. The Pre-Nectarian Period of the Lunar geologic timescale runs from 4533 million years ago (the time of the initial formation of the Moon) to 3920 million years ago The geologic time scale is a chronologic schema (or idealized Model) relating Stratigraphy to time that is used by Geologists and other The Nectarian Period of the Lunar geologic timescale runs from 3920 million years ago to 3850 million years ago The mare material, which make up the floor of the mare, is a high aluminous basalt, and consists of Upper Imbrian basalt covered by Eratosthenian basalt. Basalt (bəˈsɔːlt ˈbeisɔːlt ˈbæsɔːlt is a common Extrusive Volcanic rock. In the Lunar geologic timescale, the Upper Imbrian epoch occurred between 3800 million years ago to about 3200 million years ago The Eratosthenian period in the Lunar geologic timescale runs from 3200 million years ago to 1100 million years ago
The crater Neper is located to the north of the mare. Neper is an old lunar Impact crater located near the eastern limb of the Moon. This crater makes up part of the southern rim of Mare Marginis. Mare Marginis is a Lunar mare that lies on the very edge of the lunar nearside Just off to the northwest of the mare are the craters Schubert and 'Schubert B'. Schubert is a lunar Impact crater that lies near the eastern limb of the Moon 's near side Schubert is a lunar Impact crater that lies near the eastern limb of the Moon 's near side The dark mare-filled crater at the southern edge of Smythii is the crater Kästner. Kästner is a lunar crater that is located near the eastern limb of the Moon, to the southwest of the Mare Smythii.
The Mare Smythii is named for the 19th century British astronomer William Henry Smyth. William Henry Smyth ( January 21, 1788 &ndash September 9, 1865) was an English Sailor and Astronomer.