How many miles is halfway around the world?

Related questions

1. How do you calculate air miles?
2. How far is it from London to New York as the crow flies?
3. Can my iPhone measure distance?
4. Can you measure distance as the crow flies on Google Maps?
5. How do cameras measure distance?
6. How do we show directions on a map?
7. How does Google Maps calculate the distance?
8. Is there an app to measure distance walked?
9. How do maps help us?
10. What are the 7 elements of a map?

Tags

1. #about
2. #called
3. #shape
4. #those
5. #oblate
6. #measurements
7. #flattening
8. #miles
9. #using
10. #equatorial
11. #poles
12. #earth
13. #circumference
14. #caused
15. #spheroid
16. #however
17. #around
18. #meridional