Sun and Moon,

1
Sun and Moon, Clocks and Calendars
Dr Martin Hendry University of Glasgow
2
(No Transcript)
3
(No Transcript)
4
North
North-West
North-East
West
East
South-East
South-West
South
5
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 doesnt move, because its above the
North Pole of the Earth
6
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 doesnt move, because its above the
North Pole of the Earth
7
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 doesnt move, because its above the
North Pole of the Earth
To Pole Star
8
Finding the Pole Star
To find the Pole Star, first find the Plough,
part of the Great Bear.
9
Finding the Pole Star
To find the Pole Star, first find the Plough,
part of the Great Bear. The two end stars are
the Pointers, and point towards the Pole Star,
(which is in the Little Bear).
Pole Star
Pointers
Plough
10
We can use a sundial to tell the time
Each day the Sun rises in the East and sets in
the West
11
(No Transcript)
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
(No Transcript)
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24
(No Transcript)
25
(No Transcript)
26
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
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
During the year, the Sun appears to move through
the signs of the ZODIAC
32
Zodiac Constellations
33
The Seasons
We have Seasons because the Earth is tilted as
it orbits around the Sun
34
March 21st
Spring in the Northern Hemisphere, Autumn in the
Southern Hemisphere
35
June 21st
Summer in the Northern Hemisphere, WInter in the
Southern Hemisphere
36
September 21st
Autumn in the Northern Hemisphere, Spring in the
Southern Hemisphere
37
December 21st
Winter in the Northern Hemisphere, Summer in the
Southern Hemisphere
38
(No Transcript)
39
(No Transcript)
40
Phases of the Moon
The Moon orbits the Earth once per month. It
doesnt shine itself, but reflects light from the
Sun. This is why the Moon shows Phases
41
Phases of the Moon New Moon, to First Quarter
42
Phases of the Moon First Quarter, to Full Moon
43
Phases of the Moon Full Moon, to Third Quarter
44
Phases of the Moon Third Quarter, to New Moon
45
Orbit of the Moon
The gravity of the Earth and the Sun make the
Moons orbit wobble as it goes around the Earth.
46
(No Transcript)
47
(No Transcript)
48
Solar Eclipses
Total Eclipse Zone only about 20km across, but
sweeps over many countries as the Earth spins
49
(No Transcript)
50
May 7th 2003 Transit of Mercury
51
(No Transcript)
52
Solar Eclipses
Sometimes the Moon doesnt completely cover the
Sun. This is called an Annular Eclipse
One of these was visible from Orkney on May 31st
2003
53
(No Transcript)
54
The Sun is a star, a boiling hot ball of gas. It
gives us Heat and Light
55
The Sun is a star, a boiling hot ball of gas. It
gives us Heat and Light
56
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
57
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!!