Post on 07-Apr-2018
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The Moving Sky
Starter:
Name as many things as you can that
you can see in the sky, which areoutside the atmosphere
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Lesson Objectives:
Understand where our star signs
come from
Learn about eclipses of the Sun and
Moon
You have an A3 worksheet for the lesson listen carefully so you
can answer the questions
on the sheet!
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The Sun -days
The Sun sits in the centre of our Solar System, and
all planets orbit around the Sun
It looks from Earth asthough the Sun goes
round us once a day.
In reality, the Earth is
spinning and the Sun
stays roughly where it
is.
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The Sun - years
Over the course of the year, the Earth goes oncearound the Sun.
To explore this, we need to know about the stars in the
sky.
Astronomers say that the stars are fixed in position, so
as the Earth goes around the Sun, different stars areseen up above
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Here iswhat they
mean:
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Constellations
These are groupsof stars, named
thousands of
years ago.
The middle belt
highlighted is
called the Zodiac.
All the named constellations in the zodiac are the ones
we give to our star signs. How many can you think of...?!
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Constellations in the Zodiac
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At any time, the Sun will be in front of one of
them, we just cant see them if its daytime.
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The constellation
which is behind
the Sun when you
are born gives
you your star
sign!
(its not actually thesame these days, it is
all based on their
positions thousands
of years ago!)
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What about this star sign?
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What star sign would someone be if they were
born at this time...?
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EclipsesHas anyone ever seen an eclipse?
There are two kinds, Solar and Lunar eclipses
Lunareclipsesoccur when the
Moon passes
directly behind
the Earth fromthe Sun...
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Lunar Eclipse
The moon turns a dark rusty colour!
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A Solar EclipseThese require the moon to pass exactly between the
Sun and Earth and are rarer.
The diameter of the Moon is 81 times smaller than the
diameter of the Sun, but it is 81 times closer!
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How a Solar eclipse happens
Only totallydark part
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A Solar Eclipse
First contact
Diamond Ring
Corona light
around edge
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A Solar Eclipse - Higher
A solar eclipse happens because the apparent diameter
of the Sun and Moon is identical when viewed from
Earth roughly the same size as the width of a
thumb held at arms length.
You can check this fact using the data below use the
box on your worksheet. Should the Moon and Sun
appear the same size in the Sky?
Diameter (km) Distance Away (km)
Sun 1,392,000 149,600,000
Moon 3,474 384,399
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Plenary
Use 10 stars to make your own star sign!
Here is the
Scorpio star
sign see
how thestars trace
the shape.