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Quadrivium Astronomy

Objective   3/1/2016

Documentation on the Quadrivium Astronomy.

Astronomy     astronomy.com  6/14/2016

Wikipedia   astronomy.com

Astronomy, a natural science, is the study of celestial objects (such as stars, galaxies, planets, moons, asteroids, comets and nebulae) and processes (such as supernovae explosions, gamma ray bursts, and cosmic microwave background radiation), the physics, chemistry, and evolution of such objects and processes, and more generally all phenomena that originate outside the atmosphere of Earth.

A related but distinct subject, physical cosmology, is concerned with studying the Universe as a whole.

Astronomy is one of the oldest sciences.

The early civilizations in recorded history, such as the Babylonians, Greeks, Indians, Egyptians, Nubians, Iranians, Chinese, and Maya performed methodical observations of the night sky.

However, the invention of the telescope was required before astronomy was able to develop into a modern science.

Historically, astronomy has included disciplines as diverse as astrometry, celestial navigation, observational astronomy and the making of calendars, but professional astronomy is nowadays often considered to be synonymous with astrophysics.

During the 20th century, the field of professional astronomy split into observational and theoretical branches.

Observational astronomy is focused on acquiring data from observations of astronomical objects, which is then analyzed using basic principles of physics.

Theoretical astronomy is oriented toward the development of computer or analytical models to describe astronomical objects and phenomena.

The two fields complement each other, with theoretical astronomy seeking to explain the observational results and observations being used to confirm theoretical results.

Astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and observation of transient phenomena.

Amateur astronomers have made and contributed to many important astronomical discoveries.


Lunar Phases   4/25/2016

Wikipedia   Earth and Sky

The lunar phase or phase of the moon is the shape of the illuminated (sunlit) portion of the Moon as seen by an observer on Earth.

The lunar phases change cyclically as the Moon orbits the Earth, according to the changing positions of the Moon and Sun relative to the Earth.

The Moon's rotation is tidally locked by the Earth's gravity, therefore the same lunar surface always faces Earth.

This face is variously sunlit depending on the position of the Moon in its orbit.

Therefore, the portion of this hemisphere that is visible to an observer on Earth can vary from about 100% (full moon) to 0% (new moon).

The lunar terminator is the boundary between the illuminated and darkened hemispheres.

Each of the four "intermediate" lunar phases (see below) is roughly seven days (~7.4 days) but this varies slightly due to the elliptical shape of the Moon's orbit.

Aside from some craters near the lunar poles such as Shoemaker, all parts of the Moon see around 14.77 days of sunlight, followed by 14.77 days of "night".

The side of the Moon facing away from the Earth is sometimes called the "dark side", which is a misnomer.

It receives just as much sunlight as the Earth-facing side - actually slightly more, since the Earth never obscures the Sun from it.

Unedited NASA footage of "moon landing" - You still don't believe in a flat earth?

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