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Sun and Moon,
Clocks and Calendars
Dr Martin Hendry
University of Glasgow
North
North-West
North-East
West
East
South-West
South-East
South
If we follow the stars all night,
they seem to follow circles on
the sky, from East to West
This is because the Earth is
spinning
The Pole Star doesn’t move,
because it’s above the North
Pole of the Earth
To Pole Star
If we follow the stars all night,
they seem to follow circles on
the sky, from East to West
This is because the Earth is
spinning
The Pole Star doesn’t move,
because it’s above the North
Pole of the Earth
If we follow the stars all night,
they seem to follow circles on
the sky, from East to West
This is because the Earth is
spinning
The Pole Star doesn’t move,
because it’s above the North
Pole of the Earth
To Pole Star
Finding the Pole Star
To find the Pole Star, first
find the Plough, part of the
Great Bear.
Finding the Pole Star
To find the Pole Star, first
find the Plough, part of the
Great Bear.
Pole Star
The two end stars are the
‘Pointers’, and point
towards the Pole Star,
(which is in the Little Bear).
Pointers
Plough
We can use a
sundial to tell
the time
Each day the
Sun rises in the
East and sets
in the West
Until about 500
years ago,
astronomers
thought that the
Sun, Moon and
planets go around
the Earth
We now know that
the Earth, and all
the other planets,
go round the Sun
During the year, the Sun appears to move
through the signs of the ZODIAC
Zodiac Constellations
The Seasons
We have Seasons because the Earth is
tilted as it orbits around the Sun
March 21st
Spring in the Northern Hemisphere,
Autumn in the Southern Hemisphere
June 21st
Summer in the Northern Hemisphere,
WInter in the Southern Hemisphere
September 21st
Autumn in the Northern Hemisphere,
Spring in the Southern Hemisphere
December 21st
Winter in the Northern Hemisphere,
Summer in the Southern Hemisphere
Phases of the Moon
The Moon orbits the Earth once per month.
It doesn’t shine itself, but reflects light from
the Sun. This is why the Moon shows Phases
Phases of the Moon:
New Moon, to First Quarter
Phases of the Moon:
First Quarter, to Full Moon
Phases of the Moon:
Full Moon, to Third Quarter
Phases of the Moon:
Third Quarter, to New Moon
Orbit of the Moon
The gravity of the Earth and the Sun make the Moon’s
orbit ‘wobble’ as it goes around the Earth.
Solar Eclipses
Total Eclipse Zone
only about 20km
across, but sweeps
over many countries
as the Earth spins
May 7th 2003: Transit of Mercury
The Sun is a star, a boiling
hot ball of gas.
It gives us Heat and Light
The Sun is a star, a boiling
hot ball of gas.
It gives us Heat and Light
The Sun is a star, a boiling
hot ball of gas.
It gives us Heat and Light
Without the Sun there could be no life on Earth
The Sun is a star, a boiling
hot ball of gas.
It gives us Heat and Light
The Sun is much more
than just a way to tell the time!!