Read the link Geographic Projections. Then read appendix 3 on your text book. Now you are ready to complete this homework.
Total (20 points)
Hey guys Appendix III in your book is great it has all the info and the best graphics I have seen on this topic. Still more on this!
Local noon is the time when Sun reaches its maximum elevation on a given longitude. E.g Prime meridian England happens at 12:00 GMT
So 360 degrees divided by 24 = 15 degrees per 1 hour of change on local noon. Local noon at Miami is 17:00 GMT. So the longitude of Miami is 80.00 West. Five hours and few minutes difference.
But if you set your clock at 12:00 Miami local noon! Then you sail away and find that next local noon is at 11:00 then (in this case) you have sailed 15 degrees East of Miami so your longitude is 65 degrees west!
Polaris the North Star and the Southern Cross can be used to calculate Latitude. Their elevation on degrees above the horizon = your Latitude. So if Polaris is 45 degrees above the horizon your Latitude is 45 degrees North!
You do not need a Sextant!
1. From the latitude and longitude list below match the coordinates to the letters on the map. (3 pts)
10 degrees South, 40 degrees West _____
20 degrees South, 100 degrees East _____
20 degrees North, 40 degrees East _____
0 degrees Latitude, 140 degrees West _____
60 degrees South, 40 degrees West _____
2. Identify the following (4 pts):
A circle at 0 degrees Latitude is called the ________________.
A circle at 0 degrees Longitude is called the ________________.
A circle at 180 degrees Longitude is ‘generally’ called the _______________.
3. Answer the following (3 pts):
The maximum value for latitude ______________
The minimum value for latitude ______________
The maximum value for longitude ______________
The minimum value for longitude ______________
4. 1 degree of Latitude or Longitude can be further divided into smaller increments of minutes and seconds. (2 pts)
How many minutes subdivide 1 degree of latitude? ______________
How many seconds subdivide 1 minute of longitude? ______________
How many seconds subdivide 1 degree of longitude? ______________
5. You use an instrument called a sextant and find the following angles of the North Star or Southern Cross above the horizon. At what latitude are you for each? (Don’t forget to mention N or S) (5 pts)
Observation Your latitude
North Star (Polaris) is 5 degrees above horizon
Southern Cross is 23 degrees above horizon
Southern Cross is 89 degrees above horizon
North Star is directly above you
North Star is located on the horizon
6. Using an accurate clock and setting your watch for local noon at your home port, determine your longitude given the following information: Note: Miami Longitude is 80°W, San Diego Longitude is 110°W. (Don’t forget to mention E or W) (3 pts)
Observation Your longitude
You leave Miami and local noon shows 11am
You leave Miami and local noon shows 8am
You leave San Diego and local noon shows 2pm
You leave San Diego and local noon shows 5pm
20 points total
Instructions: Read the links in the drop box besides these are my additional suggestions:
1) Download the worksheet and keep a clean copy of the file on a safe place like your homework file. You have created it on your computer desktop.
2) Most of you do not know how to read topographic maps, if you do go ahead and get it done. But if you do not know, then read the information in the two links. You do not need to buy the book!
3) Print a copy of the worksheet and get a light brown or green coloring pencil. Locate the 0 elevation contour line and color all the area above sea level this is elevation greater than 0. Positive values indicate above sea level, negative values below sea level. So now you can see the island of Puerto Rico and the Puerto Rico Trough or Trench as well as the Hawaiian Islands. These depth values are in meters.
4) Find the highest positive values Max elevation and Max depth highest negative values found across the straight lines (vertical cross sections) across the contour lines. This thick straight line is the line of the vertical section or profile. These sections depict the variation in elevation along the line. The panels: A, B, C and D are their graphic representations.
5) To select which cross section is the right one look for the starting height or water depth at the beginning and end of the lines. Then look in between too!
1. Answer the following questions regarding Figure (1) below:
a. What is the maximum depth you would reach if you traversed along the path shown below (2 pts)? ___________________
b. What is the maximum height you would reach if you traveled along the same path (2 pts)? ___________________
c. Between what 2 depths would you experience the greatest slope (2 pts)? _____________________
d. Choose which subpanel in Figure (2) best represents the cross-section shown below (6 pts). __________________
Figure 1 (contour lines are in meters)
2. Answer the following questions regarding Figure(3) on the next page:
a. What is the maximum depth you would reach if you traversed along the path shown in Figure (3) (3 pts)? ___________________
b. What is the maximum height you would reach if you traveled along the same path (3 pts)? ___________________
c. Choose which subpanel in Figure (4) best represents the cross-section shown on Figure(3) (4 pts). __________________
Figure 3 (contour lines are in meters)
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