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The Moon. Crater Formation. Phases of the Moon. Identify the Phases . Crescent Moon - when we can see only a sliver of the moon's disk (the side of the moon facing us) Full Moon - when the moon's disk is light because the Earth is between the sun and the moon

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identify the phases
Identify the Phases
  • Crescent Moon - when we can see only a sliver of the moon's disk (the side of the moon facing us)
  • Full Moon - when the moon's disk is light because the Earth is between the sun and the moon
  • Gibbous Moon - when we can see roughly three-quarters of the moon's disk
  • Quarter - when we can see one half of the moon's disk (this is one-quarter of the entire moon's surface)
  • New Moon - when the moon's disk is dark (and invisible to us) because the moon is between the sun and the Earth
  • Waning Moon - when the moon seems to be getting smaller, going from full to gibbous to half to crescent to new
  • Waxing Moon - when the moon seems to be getting bigger, going from new to crescent to half to gibbous to full
moon phases data
Moon phases Data
  • The Moon appears to go through phases. The period of this cycle is approximately 29.5 Earth days.)
  • The moon takes about 27.3 days (about a month) to revolve around Earth, traveling at an average distance of about 384,000 kilometers.
  • Its diameter of the moon is about a quarter that of Earth's.
  • The Moon rises in the east and sets in the west daily, but its position in the sky moves EASTWARD by about 13 degrees per day.
  • (360 degrees divided by 27.32 days = 13.177 degrees per day)
orbit angle changes
Orbit Angle changes

Sidereal Month : The daily motion of this point provides a measure of the rotation of the Earth with respect to the stars, rather than the Sun.

moon phase views
Moon Phase Views

New Moon - The Moon's unilluminated side is facing the Earth.

Waxing Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight

First Quarter - One-half of the Moon appears to be illuminated by direct sunlight

Waxing Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight

moon phase views continued
Moon Phase Views continued

Full Moon - The Moon's illuminated side is facing the Earth

Waning Gibbous - The Moon appears to be more than one-half but not fully illuminated by direct sunlight.

Last Quarter - One-half of the Moon appears to be illuminated by direct sunlight

Waning Crescent - The Moon appears to be partly but less than one-half illuminated by direct sunlight

summary
Summary
  • The phases of The moon is caused by the orbit of the Moon around the Earth
  • The Sun illuminates the Moon at different angles during the month
  • The names of the Moon’s phases are based on the amount of illumination and the process of increasing size (waxing) or decreasing size (waning)
  • The orbit is divided into 4 quarters.