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Coordinates: 1°36′N 1°00′E / 1.6°N 1.0°E / 1.6; 1.0
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{{refimprove|date=June 2012}}
{{more citations needed|date=June 2012}}
{{Infobox Lunar mare
{{Infobox Lunar mare
|name=Sinus Medii
|name = Sinus Medii
|image=[[Image:Sinus-medii-clem1.jpg|200px|Sinus Medii]]
|image = Sinus Medii (LRO).png
|caption = [[Lunar Reconnaissance Orbiter|LRO]] image
|caption=
|coordinates = {{coord|1.6|N|1.0|E|globe:moon_type:landmark|display=inline,title}}
|latitude=2.4
⚫
|diameter = {{Convert|287|km|abbr=on}}
|N_or_S=N
⚫
|eponym = Bay of the Center
|longitude=1.7
|E_or_W=E
⚫
|diameter={{Convert|335|km|abbr=on}}
⚫
|eponym=Bay of the Center
}}
}}

'''Sinus Medii''' ("Central 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'''<ref name=gpn>{{gpn|5567}}</ref> {{IPAc-en|'|s|aɪ|n|ə|s|_|'|m|iː|d|i|aɪ}} ([[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]].
[[File:Aldo Ferruggia - Godin Crater.jpg|left|thumb|421x421px|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.


==Geology==
==Geology==
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[[File:Sinus Medii AS16-M-0842.jpg|thumb|right|Oblique view facing north from [[Apollo 16]]]]
[[File:Sinus Medii AS16-M-0842.jpg|thumb|right|Oblique view facing north from [[Apollo 16]]]]


The selenographic [[coordinate]]s of Sinus Medii are {{Lunar coords and quad cat|2.4|N|1.7|E}}, and its diameter is 335 km. It joins [[Mare Insularum]] in the west with [[Mare Vaporum]] to the north.
The selenographic [[coordinate]]s of Sinus Medii are {{Lunar coords and quad cat|1.6|N|1.0|E}}, and its diameter is 287&nbsp;km.<ref name=gpn/> It joins [[Mare Insularum]] in the west with [[Mare Vaporum]] to the north.


The eastern part of this area is notable for a series of [[rille]] systems. In the far northeast is the [[Rima Hyginus]], which is bisected by the crater [[Hyginus (crater)|Hyginus]]. At the far eastern end is the 220-km long [[Rima Ariadaeus]] rille which continues eastward to the edge of the [[Mare Tranquillitatis]]. At longitudes 4-6° E is the [[Rimae Triesnecker]] rille system, named after the crater [[Triesnecker (crater)|Triesnecker]] just to the west.{{citation needed|date=July 2012}}
The eastern part of this area is notable for a series of [[rille]] systems. In the far northeast is the Rima Hyginus, which is bisected by the crater [[Hyginus (crater)|Hyginus]]. At the far eastern end is the 220-km long [[Rima Ariadaeus]] rille which continues eastward to the edge of the [[Mare Tranquillitatis]]. At longitudes 4-6° E is the Rimae Triesnecker rille system, named after the crater [[Triesnecker (crater)|Triesnecker]] just to the west.<ref name=LAC59>[https://asc-planetarynames-data.s3.us-west-2.amazonaws.com/Lunar/lac_59_wac.pdf LAC 59], Lunar Astronautical Chart, Scale 1:1,000,000, Mercator Projection.</ref>


The northern edge of the Sinus Medii is formed by a highland region, with the impact craters [[Murchison (crater)|Murchison]] and [[Pallas (crater)|Pallas]] along the border. Near the northern border on this mare is the cup-shaped [[Chladni (crater)|Chladni]].{{citation needed|date=July 2012}}
The northern edge of the Sinus Medii is formed by a highland region, with the impact craters [[Murchison (crater)|Murchison]] and [[Pallas (crater)|Pallas]] along the border. Near the northern border on this mare is the cup-shaped [[Chladni (crater)|Chladni]].<ref name=LAC59/>


Another highland region lies to the south and southeastern edge of the Sinus Medii. Several flooded craters lie along this border, with [[Flammarion (lunar crater)|Flammarion]] near the western edge, then [[Oppolzer (crater)|Oppolzer]], [[Réaumur (crater)|Réaumur]], and [[Seeliger (crater)|Seeliger]] further east. The [[Rima Flammarion]] and [[Rima Oppolzer]] [[rille]]s lie along the edge of the mare near their corresponding craters. Also along the southeast border and bisecting the prime meridian is the crater [[Rhaeticus (crater)|Rhaeticus]].
Another highland region lies to the south and southeastern edge of the Sinus Medii. Several flooded craters lie along this border, with [[Flammarion (lunar crater)|Flammarion]] near the western edge, then [[Oppolzer (crater)|Oppolzer]], [[Réaumur (crater)|Réaumur]], and [[Seeliger (crater)|Seeliger]] further east. The [[Rima Flammarion]] and [[Rima Oppolzer]] [[rille]]s lie along the edge of the mare near their corresponding craters. Also along the southeast border and bisecting the prime meridian is the crater [[Rhaeticus (crater)|Rhaeticus]].
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==Names==
==Names==
[[Image:Langrenus map of the Moon 1645.jpg|thumb|right|200px|[[Michael Van Langren|Langren's]] map (1645), on which the name ''Sinus Medius'' first appeared]]
[[Image:Langrenus map of the Moon 1645.jpg|thumb|right|[[Michael van Langren|Langren's]] map (1645), on which the name ''Sinus Medius'' first appeared]]
The English astronomer [[William Gilbert (astronomer)|William Gilbert]] was the first to give a name to this mare, calling it Insula Medilunaria ("Middlemoon Island").<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.15</ref> The idea for its present name originates with [[Michael Van Langren]], who labelled it Sinus Medius in his 1645 map.<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.41, 200.</ref> [[Johannes Hevelius]] called the feature Mare Adriaticum ("The [[Adriatic Sea]]") in his 1647 map.<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.53, 201.</ref><ref name=Hevelius_1647/> [[Giovanni Riccioli]] called it Sinus Aestuum ("Bay of Hot Days") in his 1651 map.<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.61, 216, 217.</ref><ref>[[:commons:File:Riccioli1651MoonMap.jpg|Map of the Moon by Giovanni Riccioli (1651)]]</ref>
The English astronomer [[William Gilbert (astronomer)|William Gilbert]] was the first to give a name to this mare, calling it Insula Medilunaria ("Middlemoon Island").<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.15</ref> The idea for its present name originates with [[Michael van Langren]], who labelled it Sinus Medius in his 1645 map.<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.41, 200.</ref> [[Johannes Hevelius]] called the feature Mare Adriaticum ("The [[Adriatic Sea]]") in his 1647 map.<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.53, 201.</ref><ref name=Hevelius_1647>{{cite book

⚫
==Exploration==
⚫
[[Image:Surveyor 6 Fig 7-41d2.jpg|thumb|left|240px|Mosaic of the mare surface from Surveyor 6]]
⚫
The [[Surveyor 6]] mission landed to the west-southwest of [[Bruce (crater)|Bruce]] crater inside Sinus Medii in November 1967. Prior to that in July 1967, the [[Surveyor 4]] had crashed nearby.

⚫
== References ==
⚫
{{reflist|refs=
<ref name=Hevelius_1647>{{cite book
|author =Hevelius J.|author-link =Johannes Hevelius
|author =Hevelius J.|author-link =Johannes Hevelius
|title =Selenographia sive Lunae descriptio
|title =Selenographia sive Lunae descriptio
Line 46: Line 38:
|doi =10.3931/e-rara-238
|doi =10.3931/e-rara-238
|url =http://www.e-rara.ch/zut/content/pageview/160524
|url =http://www.e-rara.ch/zut/content/pageview/160524
}} ([http://www.e-rara.ch/zut/content/pageview/160527 List of names on p. 228])</ref>
}} ([http://www.e-rara.ch/zut/content/pageview/160527 List of names on p. 228])</ref> [[Giovanni Riccioli]] called it Sinus Aestuum ("Bay of Hot Days") in his 1651 map.<ref>Ewen A. Whitaker, ''Mapping and Naming the Moon'' (Cambridge University Press, 1999), p.61, 216, 217.</ref><ref>[[:commons:File:Riccioli1651MoonMap.jpg|Map of the Moon by Giovanni Riccioli (1651)]]</ref>

}}
⚫
==Exploration==
⚫
[[Image:Surveyor 6 Fig 7-41d2.jpg|thumb|left|Mosaic of the mare surface from Surveyor 6]]
⚫
The [[Surveyor 6]] mission landed to the west-southwest of [[Bruce (crater)|Bruce]] crater inside Sinus Medii in November 1967. Prior to that in July 1967, the [[Surveyor 4]] had crashed nearby.

⚫
== References ==
⚫
{{reflist|30em}}

==External links==
{{Commonscat}}
*[https://the-moon.us/wiki/Sinus_Medii Sinus Medii at The Moon Wiki]


{{Lunar maria}}
{{Lunar maria}}
{{Moon colonization}}
{{Moon colonization}}

{{Authority control}}


[[Category:Maria on the Moon|Medii, Sinus]]
[[Category:Maria on the Moon|Medii, Sinus]]

Latest revision as of 00:39, 12 August 2023

Sinus Medii
LRO image
Coordinates1°36′N 1°00′E / 1.6°N 1.0°E / 1.6; 1.0
Diameter287 km (178 mi)
EponymBay of the Center

Sinus Medii[1] /ˈsaɪnəs ˈmiːdiaɪ/ (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.

Geology

[edit]
Oblique view facing south of central Sinus Medii from Lunar Orbiter 2, showing Bruce crater at right and Oppolzer crater above left
Oblique view facing north from Apollo 16

The selenographic coordinates of Sinus Medii are 1°36′N 1°00′E / 1.6°N 1.0°E / 1.6; 1.0, and its diameter is 287 km.[1] It joins Mare Insularum in the west with Mare Vaporum to the north.

The eastern part of this area is notable for a series of rille systems. In the far northeast is the Rima Hyginus, which is bisected by the crater Hyginus. At the far eastern end is the 220-km long Rima Ariadaeus rille which continues eastward to the edge of the Mare Tranquillitatis. At longitudes 4-6° E is the Rimae Triesnecker rille system, named after the crater Triesnecker just to the west.[2]

The northern edge of the Sinus Medii is formed by a highland region, with the impact craters Murchison and Pallas along the border. Near the northern border on this mare is the cup-shaped Chladni.[2]

Another highland region lies to the south and southeastern edge of the Sinus Medii. Several flooded craters lie along this border, with Flammarion near the western edge, then Oppolzer, Réaumur, and Seeliger further east. The Rima Flammarion and Rima Oppolzer rilles lie along the edge of the mare near their corresponding craters. Also along the southeast border and bisecting the prime meridian is the crater Rhaeticus.

In the western half of the interior are the small craters Bruce and Blagg. Near the western end of the mare are the flooded craters Schröter and Sömmering.

Names

[edit]
Langren's map (1645), on which the name Sinus Medius first appeared

The English astronomer William Gilbert was the first to give a name to this mare, calling it Insula Medilunaria ("Middlemoon Island").[3] The idea for its present name originates with Michael van Langren, who labelled it Sinus Medius in his 1645 map.[4] Johannes Hevelius called the feature Mare Adriaticum ("The Adriatic Sea") in his 1647 map.[5][6] Giovanni Riccioli called it Sinus Aestuum ("Bay of Hot Days") in his 1651 map.[7][8]

Exploration

[edit]
Mosaic of the mare surface from Surveyor 6

The Surveyor 6 mission landed to the west-southwest of Bruce crater inside Sinus Medii in November 1967. Prior to that in July 1967, the Surveyor 4 had crashed nearby.

References

[edit]
  1. ^ a b "Sinus Medii". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
  2. ^ a b LAC 59, Lunar Astronautical Chart, Scale 1:1,000,000, Mercator Projection.
  3. ^ Ewen A. Whitaker, Mapping and Naming the Moon (Cambridge University Press, 1999), p.15
  4. ^ Ewen A. Whitaker, Mapping and Naming the Moon (Cambridge University Press, 1999), p.41, 200.
  5. ^ Ewen A. Whitaker, Mapping and Naming the Moon (Cambridge University Press, 1999), p.53, 201.
  6. ^ Hevelius J. (1647). Selenographia sive Lunae descriptio. Gedani: Hünefeld. pp. 226–227, 234. doi:10.3931/e-rara-238. (List of names on p. 228)
  7. ^ Ewen A. Whitaker, Mapping and Naming the Moon (Cambridge University Press, 1999), p.61, 216, 217.
  8. ^ Map of the Moon by Giovanni Riccioli (1651)
[edit]
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