A great circle crosses the equator at 127°W....

Question 1 of 31048fy_heal_CREATE_q183_2027

A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude?

Back

Question 1 of 31048

Q

A great circle crosses the equator at 127°W. It will also cross the equator at what other longitude?

🔍 Key Concepts

• How great circles are formed by planes that pass through the center of the Earth • How points that are antipodal (directly opposite each other on the globe) relate in longitude • The idea that longitudes on the equator that are opposite each other differ by 180°

💭 Think About

• If one intersection with the equator is at 127°W, what longitude would you get if you move exactly 180° of longitude around the equator? • When you add 180° to a west longitude and go past 180°, how do you convert that result into an east longitude? • Which option, when compared with 127°W, represents a point that is directly opposite on the globe (i.e., 180° away)?

✅ Before You Answer

• Calculate 127° + 180° carefully and notice it is greater than 180° • Convert a longitude greater than 180°W into an equivalent east longitude by subtracting from 360° • Check which choice matches the converted east longitude that is 180° away from 127°W on the equator