Labeled diagram of a plant cell showing key organelles and structures.

1. The equator is the line of latitude that divides the Earth into the Northern and Southern Hemispheres.
2. The prime meridian is the line of longitude that divides the Earth into the Eastern and Western Hemispheres.
3. Latitude lines run east-west and measure distance north or south of the equator.
4. Longitude lines run north-south and measure distance east or west of the prime meridian.
5. The Tropic of Cancer is located at 23.5° N latitude.
6. The Tropic of Capricorn is located at 23.5° S latitude.
7. The Arctic Circle is located at 66.5° N latitude.
8. The Antarctic Circle is located at 66.5° S latitude.
9. The North Pole is located at 90° N latitude.
10. The South Pole is located at 90° S latitude.
11. The International Date Line is approximately at 180° longitude.
12. The equator has a latitude of 0°.
13. The prime meridian has a longitude of 0°.
14. The Tropic of Cancer marks the northernmost point where the sun can be directly overhead.
15. The Tropic of Capricorn marks the southernmost point where the sun can be directly overhead.
16. The Arctic Circle marks the southernmost point where the midnight sun and polar night occur.
17. The Antarctic Circle marks the northernmost point where the midnight sun and polar night occur.
18. The North Pole experiences six months of daylight and six months of darkness each year.
19. The South Pole experiences six months of daylight and six months of darkness each year.
20. The equator receives the most direct sunlight throughout the year.