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Feature on the moon
Sinus Medii
LRO image
Coordinates
1°36′N1°00′E / 1.6°N 1.0°E / 1.6; 1.0
Diameter
287 km (178 mi)
Eponym
Bay of the Center
Sinus Medii[1]/ˈsaɪnəsˈmiːdiaɪ/ (Latin sinus mediī "Middle Bay") is a small lunar mare. It takes its name from its location at the intersection of the Moon's equator and prime meridian; as seen from the Earth, this feature is located in the central part of the Moon's near side, and it is the point closest to the Earth. From this spot, the Earth would always appear directly overhead, although the planet's position would vary slightly due to libration.
Sinus Medii and closer craters with mineral postprocessing
During the Apollo program, Sinus Medii was designated Apollo Landing Site 3 (ALS3). Flight operations planners were concerned about having the optimum lighting conditions at the landing site. Hence, alternative landing sites moved progressively westward, following the terminator. A delay of two days for weather or equipment reasons would have sent Apollo 11 to Sinus Medii instead of ALS2, Mare Tranquillitatis (where it actually landed); another two-day delay would have resulted in ALS5, a site in Oceanus Procellarum, being targeted.
^"Sinus Medii". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
writing (e.g., Sinus Magnus, Sinus Flanaticus, etc.) Sine, a trigonometric math function (Latin sinus) SinusMedii, a small lunar mare Sinus Successus, a...
the one oceanus as well as features known by the names lacus, palus and sinus. The modern system of lunar nomenclature was introduced in 1651 by Giovanni...
two days for weather or equipment reasons would have sent Apollo 11 to SinusMedii (designated ALS3) instead of ALS2—Mare Tranquillitatis; another two-day...
was lost 2.5 minutes before touchdown. The planned landing target was SinusMedii (Central Bay) at 0.4° north latitude and 1.33° west longitude. Surveyor...
program that reached the surface of the Moon. Surveyor 6 landed on the SinusMedii. A total of 30,027 images were transmitted to Earth. This spacecraft...
12:32 UTC on 20 September 1966. The target area proposed was within SinusMedii. The Atlas-Centaur had placed Surveyor 2 on a path to the Moon that was...
show more than one structure are termed hybrid rilles. Rima Hyginus in SinusMedii is an example, initially formed through a fault and subsequently subject...
of Tranquility (Mare Tranquillitatis); Site 3 was in the Central Bay (SinusMedii); and Sites 4 and 5 were in the Ocean of Storms (Oceanus Procellarum)...
particular sites: northern part of Sinus Aestuum, near the Eratosthenes crater southern part of Sinus Aestuum near SinusMedii southwest coast of Mare Imbrium...
would land at the site next further west from the Sea of Tranquility, in SinusMedii. However, NASA planning coordinator Jack Sevier and engineers at the...
includes the one oceanus and the features known by the names lacus, palus and sinus. The modern system of lunar nomenclature was introduced in 1651 by Riccioli...
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