# File

```CGC 1D1
Date:
Name:
Seasons in the Hemispheres
1
Grid Systems:
ALPHANEWMERIC GRID
13
14
15
16
L
M
N
O
FOUR-DIGIT GRID REFERENCE:
Give the Four Digit Grid Reference for: 14-
5-
6-
2-
3-
(if you were not in class, see the powerpoint)
SIX-DIGIT GRID REFERENCE:
Give the Six-Digit Grid Reference for the letters:
A.
B.
C.
D.
(If you were not in class see the powerpoint for answers)
2
Latitude &amp; Longitude
If the Earth were flat, rectangular coordinates (x,y) would be sufficient to
describe the locations of points on its surface. However, Earth is a sphere with
no sides, and a special frame of reference is needed. The poles of Earth provide
this reference frame.
Lines of Latitude
EQUATOR – an imaginary line that divides the Earth into 2 equal parts
(Northern &amp; Southern hemispheres)
•
•
•
•
•
•
Are imaginary lines
The Equator is the starting point for latitude lines
Measure the distance North &amp; South of the Equator
Lines are drawn around the Earth, parallel to the Equator
Lines never intersect each other
Lines are approximately 111 km apart
• Lines are used as political boundaries
3
Lines of Longitude
PRIME MERIDIAN – an imaginary line that divides the Earth into 2 equal parts
(Eastern &amp; Western hemispheres)
• Are imaginary lines
• The Prime Meridian is the starting point for longitude lines
• The International Date Line is the 180 degree meridian
• Measure the distance East and West of the Prime Meridian
• Lines are drawn from the North Pole to the South Pole
• Lines converge at the poles and are furthest apart at the Equator
• Longitude lines are longer than latitude lines
• Lines are used to determine time zones
ABSOLUTE LOCATION – the location of a point on the Earth using
latitude and longitude lines
Using the latitude &amp; longitude grid we can pinpoint any place on the
Earth. This location is specified by a series of numbers
degrees minutes seconds
44 25 14 N
4
Using Latitude and Longitude
To find your exact location on a map, you need to determine which latitude line and which longitude line
meet where you are standing. When writing locations, the latitude is given first. Miami, Florida has a
location of 250 North and 800 West. This is usually written in short form as 250N 800W.
50 E
40 E
Give the latitude and longitude of the objects positioned on the grid below.
30 E
20 E
10 E
0
10 W
20 W
30 W
degrees
40 W
50 W
50 N
40 N
30 N
20 N
10 N
0 degrees
10 S
20 S
30 S
40 S
50 S
1. Beaver ____________________
5. Seal______________________
2. Maple Leaf _________________
6. Racoon ___________________
3. Moose ____________________
7. Polar Bear _________________
4. Wolf ______________________
5
You Sunk My Battleship!
Instructions
a) Draw the following ships onto your grid, either vertically or horizontally (don’t show your partner)
1 Air Craft Carrier – 5 squares
1 Battleship – 4 squares
1 Submarine – 3 squares
1 Cruiser – 3 squares
1 Destroyer – 2 squares
b) With a partner take turns calling out the gird reference (i.e. 3080 – bottom left corner box). When
a grid reference is called, each player must tell whether it is a “HIT” or a “MISS”. When a
reference includes a whole ship, that ship sinks. If only part of a ship is hit, the remaining parts
must be called out before the ship is sunk.
c) Both players keep track of their calls on their target grid (where you’re shooting) and on their
ocean grid (where your opponent is shooting)
d) The first player to sink the other players’ ships, wins!
92
91
90
Target Grid
89
88
87
86
85
84
83
82
81
80
30
31
32
33
34
35
36
37
38
39
40
41
42
92
91
90
Ocean Grid
89
88
87
86
85
84
83
82
81
80
30
31
32
33
34
35
36
6
37
38
39
40
41
42
```