#1

Homework Assignment #1: NAME ___________________ Instructions:

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

1. Homework Assignment 1 NAME:
2. From the latitude and longitude list below match the coordinates to the letters on the map 3 pts:
3. undefined:
4. 1:
5. 2:
6. 3:
7. A circle at 0 degrees Latitude is called the:
8. A circle at 0 degrees Longitude is called the:
9. A circle at 180 degrees Longitude is generally called the:
10. The maximum value for latitude:
11. The minimum value for latitude:
12. The maximum value for longitude:
13. The minimum value for longitude:
14. How many minutes subdivide 1 degree of latitude:
15. How many seconds subdivide 1 minute of longitude:
16. How many seconds subdivide 1 degree of longitude:
17. Observation:
18. Your latitudeNorth Star Polaris is 5 degrees above horizon:
19. Your latitudeSouthern Cross is 23 degrees above horizon:
20. Your latitudeSouthern Cross is 89 degrees above horizon:
21. Your latitudeNorth Star is directly above you:
22. Your latitudeNorth Star is located on the horizon:
23. Observation_2:
24. Your longitudeYou leave Miami and local noon shows 11am:
25. Your longitudeYou leave Miami and local noon shows 8am:
26. Your longitudeYou leave San Diego and local noon shows 2pm:
27. Your longitudeYou leave San Diego and local noon shows 5pm: