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Night sky is a commonly used term most often employed to refer to the sky
Sky

The sky is the part of the atmosphere or of outer space visible from the surface of any astronomical object. It is difficult to define precisely for several reasons....
 as it is seen at night
Night

Night or nighttime is the period of time when the sun is below the horizon. The opposite of night is day . Time of day varies based on factors such as season, latitude, longitude and timezone....
. The term is usually associated with astronomy
Astronomy

Astronomy is the science of Astronomical object and Phenomenon that originate outside the Earth's atmosphere . It is concerned with the evolution, physics, chemistry, meteorology, and motion of celestial objects, as well as the physical cosmology....
, with reference to views of heavenly bodies such as star
Star

A star is a massive, luminous ball of Plasma that is held together by its own gravity. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth....
s, the Moon
Moon

The Moon is Earth's only natural satellite and the List of natural satellites by diameter satellite in the Solar System. The average centre-to-centre distance from the Earth to the Moon is km, about thirty times the diameter of the Earth....
 and planet
Planet

A planet , as 2006 definition of planet by the International Astronomical Union , is a celestial body orbiting a star or Stellar evolution#Stellar remnants that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared the neighbourhood of planetesimals....
s that become visible on a clear night after the Sun
Sun

The Sun , a G V star, is the star at the center of the Solar System. The Earth and other matter orbit the Sun, which by itself accounts for about 98.6% of the Solar System's mass....
 has set.

The night sky and studies of it have a historical place in both ancient and modern cultures.






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Moonfromoakland04052006
Night sky is a commonly used term most often employed to refer to the sky
Sky

The sky is the part of the atmosphere or of outer space visible from the surface of any astronomical object. It is difficult to define precisely for several reasons....
 as it is seen at night
Night

Night or nighttime is the period of time when the sun is below the horizon. The opposite of night is day . Time of day varies based on factors such as season, latitude, longitude and timezone....
. The term is usually associated with astronomy
Astronomy

Astronomy is the science of Astronomical object and Phenomenon that originate outside the Earth's atmosphere . It is concerned with the evolution, physics, chemistry, meteorology, and motion of celestial objects, as well as the physical cosmology....
, with reference to views of heavenly bodies such as star
Star

A star is a massive, luminous ball of Plasma that is held together by its own gravity. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth....
s, the Moon
Moon

The Moon is Earth's only natural satellite and the List of natural satellites by diameter satellite in the Solar System. The average centre-to-centre distance from the Earth to the Moon is km, about thirty times the diameter of the Earth....
 and planet
Planet

A planet , as 2006 definition of planet by the International Astronomical Union , is a celestial body orbiting a star or Stellar evolution#Stellar remnants that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared the neighbourhood of planetesimals....
s that become visible on a clear night after the Sun
Sun

The Sun , a G V star, is the star at the center of the Solar System. The Earth and other matter orbit the Sun, which by itself accounts for about 98.6% of the Solar System's mass....
 has set.

The night sky and studies of it have a historical place in both ancient and modern cultures. In the past, for instance, farmers have used the state of the night sky as a calendar
Calendar

A calendar is a system of organize days for a social, religious, commercial or administrative purpose. This organization is done by giving names to periods of time ? typically days, weeks, months and years....
 to determine when to plant crops
Agriculture

Agriculture refers to the production of food and goods through farming and forestry. Agriculture was the key development that led to the rise of civilization, with the animal husbandry of domestication animals and plants creating food surpluses that enabled the development of more Population density and Social stratification societies....
. Many cultures have drawn constellation
Constellation

A constellation is a group of stars that appear to have a physical proximity in the sky. The stars in a constellation are often vastly distant from each other, but they appear close to each other from the perspective of Earth....
s between stars
STARS

STARS can mean:*Fulton surface-to-air recovery system*Shock Trauma Air Rescue Society*STARS members in Resident Evil, a fictional task force that appears in Capcom's Resident Evil video game franchise....
 in the sky, using them in association with legends
Legends

Legends may refer to:* Legend, an historical narrativeIn music:*Legends , a 1998 album*Legends , a 1999 album*Legends , a 2005 album...
 and mythology
Mythology

The word mythology refers to a body of folklore/myths/legends that a particular culture believes to be true and that often use the supernatural to interpret natural events and to explain the nature of the universe and humanity....
 about their deities.

The anciently developed
History of astrology

The history of Astrology encompasses a great span of human history and many cultures. The belief in a connection between the cosmos and terrestrial matters has also played an important part in human history....
 belief of astrology
Astrology

Astrology is a group of systems, traditions, and beliefs which hold that the relative positions of astronomical object and related details can provide useful information about personality, human affairs, and other terrestrial matters....
 is generally based on the belief that relationships between heavenly bodies influence or convey information about events on Earth
Earth

Earth is the third planet from the Sun. Earth is the largest of the terrestrial planets in the Solar System in diameter, mass and density. It is also referred to as the World and Wiktionary:Terra.Note that by International Astronomical Union convention, the term "Terra" is used for naming extensive land masses, rather...
. The scientific study of the night sky and bodies observed within it, meanwhile, takes place in the science of astronomy
Astronomy

Astronomy is the science of Astronomical object and Phenomenon that originate outside the Earth's atmosphere . It is concerned with the evolution, physics, chemistry, meteorology, and motion of celestial objects, as well as the physical cosmology....
.

The visibility of celestial objects in the night sky is affected by light pollution
Light pollution

Light pollution, also known as photopollution or luminous pollution, is excessive or obtrusive artificial light. The International Dark-Sky Association , "The Light Pollution Authority," defines light pollution as: It obscures the stars in the night sky for city dwellers, interferes with astronomy observatory, and, like an...
. The presence of the Moon
Moon

The Moon is Earth's only natural satellite and the List of natural satellites by diameter satellite in the Solar System. The average centre-to-centre distance from the Earth to the Moon is km, about thirty times the diameter of the Earth....
 in the night sky has historically hindered astronomical observation by increasing the amount of ambient lighting. With the advent of artificial light sources, however, light pollution has been a growing problem for viewing the night sky. Special filters and modifications to light fixtures can help to alleviate this problem, but for the best seeing both professional and amateur optical astronomers seeks viewing sites located far from major urban areas.

See also

Universum
* Amateur astronomy
Amateur astronomy

Amateur astronomy, a subset of astronomy, is a hobby whose participants enjoy studying and observing celestial objects....
  • Asterism (astronomy)
    Asterism (astronomy)

    In astronomy, an asterism is a pattern of stars seen in Earth's sky which is not an official constellation. Like constellations, they are composed of stars which, while they are in the same general direction, are not physically related, often being at significantly different distances from Earth....
  • Astrology
    Astrology

    Astrology is a group of systems, traditions, and beliefs which hold that the relative positions of astronomical object and related details can provide useful information about personality, human affairs, and other terrestrial matters....
  • Astronomical object
    Astronomical object

    s are significant entity, associations or structures which current science has confirmed to exist in outer space. This does not necessarily mean that more current science will not disprove their existence....
  • Constellation
    Constellation

    A constellation is a group of stars that appear to have a physical proximity in the sky. The stars in a constellation are often vastly distant from each other, but they appear close to each other from the perspective of Earth....
  • Planetarium
    Planetarium

    File:Planetarium-Thursday-1-July-2008.JPGFile:Belgrade Planetarium theatre day.jpgFile:Belgrade Planetarium theatre night.jpgA planetarium is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation....