Post on 22-Jun-2015
THE SOLAR SYSTEMSEASONS, MOON
&ECLIPSES
REVIEW FOR THE EXAM
SEASONSThere are four different seasons in a year because the Earth´s axis is tilted. As the Earth moves around the Sun, some parts of the Earth get different amounts of light depending on the moment of the year.
SEASONSSUMMER AND WINTER
When we are in summer or in witer is because the Northern hemisphereis pointing to the Sun or pointing away from the Sun.
WHY DOES THIS HAPPEN?
WinterSummer
SEASONSSUMMER AND WINTER
The hemisphere that is pointing to the Sun gets more heat and light than the hemisphere that is pointing away from the Sun.
Winter
Summer
SEASONSSPRING AND AUTUMN
During spring and autumn the poles aren´t pointing to the Sun. So both hemispheres get the same amount of light. REMEMBER!!!
The Earth is always tilted. In this drawing we see it straight due to the oint of view.We change the point of view to see the Earth next to the Sun instead of in front of and behind the Sun.
MOONFrom the Earth we always see the same half of the Moon.
WHY?Because the Moon takes the same time to do a complete spin on its axis and to do a complete lap around the Earth (28 days).
Imagine the Moon is a clock that goes around another clock(the Earth).Every time it moves a quarter around the big clock, it also spins a quarter on itself.
MOONWe see different Moon phases.
WHY?The Moon is a satellite, a non luminous celestial body. We see it because it reflects the light of the Sun.
Depending on the place the Moon is ,according to the Earth and the Sun, we can see different illuminated areas.
New Moon Full Moon
First quarter
Last quarter
ECLIPSESWHAT ARE ECLIPSES?
They are shadows produced by one non luminous celestial body on another non luminous celestial body.
From the Earth we can see Lunar or Solar eclipses.
How are they produced?
ECLIPSESLUNAR ECLIPSES
As we said before, eclipses are shadows. A lunar eclipse is the shadow of the Earth covering the Moon.
ECLIPSESSOLAR ECLIPSES
Solar eclipses are produced because the Moon produces a shadow on the Earth. People who are in the place of the Earth where the Moon shadow is, can see the eclipse.
If you need more information or you are still having doubts, have a look
at the videos on the blog, ask me by e-mail or by a comment on the blog
or check your unit.