moon phases.
moon phases are called to the various aspects under which the Moon appears to depend on the relative position of the Sun, Earth and Moon, in a cyclical proceo determined by the various states of enlightenment in which shows the lunar disk. If you watch me to the moon on successive days we see their apparent shape varies from day to day.
The period of this cycle or lunation is a synodic month. To explain this phenomenon assume phase to earth at the center of a circle that represents the lunar orbit. Assuming the Sun on the right, the hemisphere of the Moon that appears to be illuminated and dark sun reversed.
The origin of the lunar cycle is in the so-called new moon or new moon, when the moon is in conjunction with the Sun at this time starts a synodic revolution. The Earth Moon presents the hemisphere not illuminated by the Sun, and is dark, therefore, we see the moon. Age is called the Moon for a given time of the lunation the time between the New Moon (age = 0) and that instant. The rising and setting of the moon and the sun almost coincide, as well as the passage of these stars over the meridian. Having the moon a proper motion journal close to 13 º in the forward direction, while the Sun moves 1 to day, the Moon moves with respect to the sun about 13 ° per day and, therefore, 2 or 3 days after new moon is submitted after the setting of the sun in the form of thin spindle, and a piece with horns to the left.
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