The phases of the moon are caused by the relative positions of the sun, Earth and moon. The moon travels around the Earth, taking just over 29 days to complete a single orbit. The sun illuminates the moon from various an... More »

The phases of the moon, from darkest to brightest, are the new moon, the crescent moon, the quarter moon, the gibbous moon and the full moon. As the moon fills out in the sky, it passes through the waxing crescent, first... More » Science Astronomy Our Moon

The moon rises in the eastern sky and sets in the western sky because of Earth's rotation. Its rising and setting positions vary throughout the year from northeast/northwest to due east/west to southeast/southwest. More »

Moon phases occur because the angle of the Earth, moon and sun changes as the moon orbits the Earth. One-half of the moon is always illuminated by the sun. As a person's angle of sight changes, different portions of sunl... More » Science Astronomy Our Moon

The phases of the moon are caused by the light from the sun and the position of the moon with regard to the Earth and sun. Depending on these positions, the moon appears to be in any one of eight major phases from Earth.... More » Science Astronomy Our Moon

According to NASA, the phases of the moon are caused by the sunlight and shadow created by its relative position to the sun. At two points during the 29.5-day lunar cycle, the side of the moon facing the Earth is half in... More »

The gravitational pull of the moon controls the rise and fall of tides on Earth and slows the planet's rotation, while the phases of the moon serve as calendar markers for human beings. High tides occur on the portion of... More »