moon phases. vocabulary to help revolution – the motion of the moon around earth, one complete...
TRANSCRIPT
Vocabulary To Help• Revolution – the motion of the moon around
Earth, one complete orbit• Phase – the shape of the moon as seen from the
Earth• Waxing-describes a moon that seems to be
getting bigger each night• Waning – describes a moon that seems to be
getting smaller each night• Crescent – a moon that is smaller than a quarter
moon, but larger than the new moon• Gibbous – a moon that is larger than a quarter
moon, but smaller than a full moon
Half of the Moon is always lit up by the sun. As the Moon orbits the Earth, we see different parts of the lighted area.
http://www.nasm.si.edu/apollo30th/moontheater/phasepage2.html
The revolution of the Moon around the Earth makes the Moon look as if it is
changing shape in the sky.
http://btc.montana.edu/ceres/html/birthdayphases.htm
This is caused by the different
angles from which we see the
illuminated part of the Moon's
surface. These are called
"phases" of the Moon.
http://btc.montana.edu/ceres/html/birthdayphases.htm
• The phase you see when you look at the moon depends on its location in relationship to the sun and Earth
• The moon doesn’t create any light itself; it just reflects the light of the sun.
http://www.niehs.nih.gov/kids/lunar/why_phases.gif
The Moon passes through eight major shapes during a cycle that repeats itself every 29.5 days. The phases
always follow one another in the same order:
New Moon
The moon is lined up between the Earth and the Sun almost in a straight line
•The illuminated half of the moon is facing away from the Earth, and therefore the part that is facing us is all dark
•The moon and the Sun rise and set at about the same time
Waxing Crescent Moon
As the moon moves around the Earth, we see more and more of the illuminated half•This Moon can be seen after the New Moon, but before the First Quarter Moon.•It looks as if the moon is getting bigger each night.•The moon is smaller than a quarter moon.•The moon is waxing (increasing or growing)
http://btc.montana.edu/ceres/html/birthdayphases.html
Waxing Crescent Moon
http://btc.montana.edu/ceres/html/birthdayphases.html
First Quarter Moon• A week after the new moon, when the
Moon has completed about a quarter of its turn around the Earth, we can see half of the illuminated part.
• From Earth, we are looking at the sunlit side of the Moon from off to the side.
• The right half of the Moon appears lighted and the left side of the Moon appears dark.
• A quarter of the moon
Waxing Gibbous Moon
• During the next week, we keep seeing more and more of the illuminated part of the Moon making it appear to grow larger and larger every day.
• Waxing gibbous– Gibbous means “humped”.
http://btc.montana.edu/ceres/html/birthdayphases.html
Waxing Gibbous Moon
http://btc.montana.edu/ceres/html/birthdayphases.html
Full Moon• Two weeks after the new moon, the moon
is now halfway through its revolution of the Earth.
• The illuminated half of the Moon is facing the Earth.
• The Earth, Sun, and Moon are nearly in a straight line, with the Earth in the middle.
• At this time the Moon rises at the time the Sun sets and it sets when the Sun rises.
Waning Gibbous Moon
• This Moon can be seen the first week after the Full Moon, but before the Last Quarter Moon.
• From this point, until it becomes new again, the illuminated part of the Moon that we can see gets smaller.
http://btc.montana.edu/ceres/html/birthdayphases.html
Waning Gibbous Moon
http://btc.montana.edu/ceres/html/birthdayphases.html
Last (Third) Quarter Moon
• Three weeks after the new moon, we again can see half of the illuminated part.
• The left half of the Moon appears lighted, and the right side of the Moon appears dark.
Waning Crescent Moon
• This Moon can be seen after the Last Quarter Moon and before the New Moon.
• During the fourth week, the crescent moon will appear to get smaller and smaller
http://btc.montana.edu/ceres/html/birthdayphases.html
Moon Movie
The movie is an animated GIF created by Antonio Cidadao from a sequence of still images taken during March and April 1998. Copyright Antonio Cidadao.
http://aa.usno.navy.mil/faq/docs/moon_phases.html