Half Moon

Half Moon refers to the two lunar phases commonly known as first quarter and last quarter.

Examples of Half Moon used in culture...

Human settlements

Watercraft

Moon Bay

Moon Bay is a bay 7 nautical miles (13 km) wide which recedes 4 nautical miles (7 km) between Edinburgh Hill and Renier Point, on the east side of Livingston Island, in the South Shetland Islands off Antarctica. The glaciers Sopot Ice Piedmont, Iskar, Huron, Struma, Kaliakra, Panega and Debelt feed the bay.

The bay was known to sealers in the area as early as 1821. It was recharted in 1935 by Discovery Investigations personnel on the Discovery II, and probably named by them for nearby Half Moon Island, which lies in the entrance to the bay.

Maps

Half Moon Bay, California

Half Moon Bay is a coastal city in San Mateo County, California, United States. Its population was 11,324 as of the 2010 census. Immediately at the north of Half Moon Bay is the Pillar Point Harbor and the unincorporated community of Princeton-by-the-Sea. The urban area had a population of 20,713 at the same census.

History

Half Moon Bay began as a rural agriculture area, primarily used for grazing of cattle, horses, and oxen used by Mission San Francisco de Asis (established in June 1776). Following the secularization of the Mission, Tiburcio Vásquez received the Rancho Corral de Tierra Mexican land grant in 1839 and Candelario Miramontes was granted Rancho Miramontes (later known as Rancho San Benito) in 1841.

The community began to develop in the 1840s as the first real town in San Mateo County. Known originally as San Benito, the town was renamed Spanishtown and attracted a thriving fishing industry in addition to its continued importance to coastal agriculture. Spanishtown became a racially diverse community, settled by Canadians, Chinese, English, Germans, Irish, Mexicans, Italians, Scots, Portuguese, and Pacific Islanders. Regular stagecoach service was established with San Mateo; coaches also served the communities of Purissima, Lobitos, and San Gregorio. Levy Brothers opened a department store in downtown Half Moon Bay. Spanishtown was officially renamed Half Moon Bay in 1874.

Moon

The Moon (in Greek: σελήνη Selene, in Latin: Luna) is Earth's only natural satellite. It is one of the largest natural satellites in the Solar System, and, among planetary satellites, the largest relative to the size of the planet it orbits (its primary). It is the second-densest satellite among those whose densities are known (after Jupiter's satellite Io).

The Moon is thought to have formed approximately 4.5 billion years ago, not long after Earth. There are several hypotheses for its origin; the most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.

The Moon is in synchronous rotation with Earth, always showing the same face with its near side marked by dark volcanic maria that fill between the bright ancient crustal highlands and the prominent impact craters. It is the second-brightest regularly visible celestial object in Earth's sky after the Sun, as measured by illuminance on Earth's surface. Although it can appear a very bright white, its surface is actually dark, with a reflectance just slightly higher than that of worn asphalt. Its prominence in the sky and its regular cycle of phases have, since ancient times, made the Moon an important cultural influence on language, calendars, art, and mythology.

One half

One half is the irreducible fraction resulting from dividing one by two (¹⁄₂), or the fraction resulting from dividing any number by its double. Multiplication by one half is equivalent to division by two, or halving; conversely, division by one half is equivalent to multiplication by two, or "doubling". One half appears often in mathematical equations, recipes, measurements, etc. Half can also be said to be one part of something divided into two equal parts.

For instance, the area S of a triangle is computed

One half also figures in the formula for calculating figurate numbers, such as triangular numbers and pentagonal numbers:

and in the formula for computing magic constants for magic squares

The Riemann hypothesis states that every nontrivial complex root of the Riemann zeta function has a real part equal to ¹⁄₂.

One half has two different decimal expansions, the familiar 0.5 and the recurring 0.49999999... It has a similar pair of expansions in any even base. It is a common trap to believe these expressions represent distinct numbers: see the proof that 0.999... equals 1 for detailed discussion of a related case. In odd bases, one half has no terminating representation, only a single representation with a repeating fractional component, such as 0.11111111... in ternary.