Near side of the Moon

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The names of the major maria and some craters on the near side of the Moon

The near side of the Moon is the lunar hemisphere that is permanently turned towards Earth, whereas the opposite side is the far side. Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth – a situation known as synchronous rotation, or tidal locking.

The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases. Sometimes the dark portion of the Moon is faintly visible due to earthshine, which is indirect sunlight reflected from the surface of Earth and onto the Moon.

Since the Moon's orbit is both somewhat elliptical and inclined to its equatorial plane, libration allows up to 59% of the Moon's surface to be viewed from Earth (though only half at any moment from any point).

Over one lunar month more than half of the Moon's surface can be seen from the surface of the Earth.
The near side as observed (from Earth's Northern Hemisphere) over the course of one month, showing the libration effects

Orientation

Detailed view by NASA's LRO

The image of the Moon here is drawn as is normally shown on maps, that is with north on top and west to the left. Astronomers usually turn the map over to have south on top, as to correspond with the view in most telescopes which also show the image upside down.

West and east on the Moon are where you would expect them, when standing on the Moon. But when we, on Earth, see the Moon in the sky, then the east–west direction is just reversed. When specifying coordinates on the Moon it should therefore always be mentioned whether geographic (or rather selenographic) coordinates are used or astronomical coordinates.

The actual orientation you see the Moon in the sky or on the horizon depends on your geographic latitude on Earth. In the following description a few typical cases will be considered.

  • On the north pole, if the Moon is visible, it stands low above the horizon with its north pole up.
  • In mid northern latitudes (North America, Europe, Asia) the Moon rises in the east with its northeastern limb up (Mare Crisium), it reaches its highest point in the south with its north on top, and sets in the west with its northwestern limb (Mare Imbrium) on top.
  • On the equator, when the Moon rises in the east, its N — S axis appears horizontal and Mare Foecunditatis is on top. When it sets in the west, about 12.5 hours later, the axis is still horizontal, and Oceanus Procellarum is the last area to dip below the horizon. In between these events, the Moon reached its highest point in the zenith and then its selenographic directions are lined up with those on Earth.
  • In mid southern latitudes (South America, South Pacific, Australia, South Africa) the Moon rises in the east with its southeastern limb up (Mare Nectaris), it reaches its highest point in the north with its south on top, and sets in the west with its southwestern limb (Mare Humorum) on top.
  • On the south pole the Moon behaves as on the north pole, but there it appears with its south pole up.
Schematics of moonrise on different Earth latitudes
Moon – Oceanus Procellarum ("Ocean of Storms")
Ancient rift valleys – rectangular structure (visible – topography – GRAIL gravity gradients) (October 1, 2014).
Ancient rift valleys – context.
Ancient rift valleys – closeup (artist's concept).

Differences

The two hemispheres have distinctly different appearances, with the near side covered in multiple, large maria (Latin for 'seas'). These lowlands were believed to be seas of lunar water by the astronomers who first mapped them, in the 17th century (notably, Giovanni Battista Riccioli and Francesco Maria Grimaldi). Although no bodies of liquid exist on the Moon, the term "mare" (plural: maria) is still used. The far side has a battered, densely cratered appearance with few maria. Only 1% of the surface of the far side is covered by maria,[1] compared to 31.2% on the near side. According to research analyzed by NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission, the reason for the difference is because the Moon's crust is thinner on the near side compared to the far side.[2] The dark splotches that make up the large lunar maria are lava-filled impact basins that were created by asteroid impacts about four billion years ago. Though both sides of the Moon were bombarded by similarly large impactors, the near side hemisphere crust and upper mantle was hotter than that of the far side, resulting in the larger impact craters.[3] These larger impact craters make up the Man in the Moon references from popular mythology.

See also

References

  1. ^ J. J. Gillis; P. D. Spudis (1996). "The Composition and Geologic Setting of Lunar Far Side Maria". Lunar and Planetary Science. 27: 413. Bibcode:1996LPI....27..413G.
  2. ^ Universe Today
  3. ^ Science Magazine

Further reading

  • John Moore (2014). Craters of the Near Side Moon. Createspace Independent Pub. ISBN 978-1-4973-2444-2.

External links

  • Lunar and Planetary Institute: Exploring the Moon
  • Lunar and Planetary Institute: Lunar Atlases
  • Ralph Aeschliman Planetary Cartography and Graphics: Lunar Maps
  • NASA’s Gravity Recovery and Interior Laboratory (GRAIL) Mission
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