Question

Great circle are the shortest routes between two places

Answer 1

The great-circle distance or orthodromic distance is the shortest distance between two points on the surface of a sphere, measured along the surface of the sphere (as opposedto a straight line through the sphere's interior).

Answer 2

ᴛʜᴇ ɪᴍᴘᴏʀᴛᴀɴᴄᴇ ᴏꜰ ᴛʜᴇ ɢʀᴇᴀᴛ ᴄɪʀᴄʟᴇꜱ ɪꜱ ᴛʜᴀᴛ ᴛʜᴇꜱᴇ ᴀʀᴇ ᴛʜᴇ ꜱʜᴏʀᴛᴇꜱᴛ ʀᴏᴜᴛᴇꜱ ᴏɴ ᴛʜᴇ ꜰᴀᴄᴇ ᴏꜰ ᴛʜᴇ ᴇᴀʀᴛʜ .ᴀʟᴛʜᴏɢʜᴛ ᴏɴ ᴛʜᴇ ʟᴀɴᴅ ᴀʀᴇᴀ ᴛʀᴀᴠᴇʟʟɪɴɢ ʀᴏᴜᴛᴇꜱ ᴀʀᴇ ꜰɪxᴇᴅ ᴀᴄᴄᴏʀᴅɪɴɢ ᴛᴏ ᴛʜᴇ ʀᴏᴀᴅꜱ ᴀɴᴅ ʀᴀɪʟᴡᴀʏꜱ.ʙᴜᴛ ᴏɴ ᴏᴄᴇᴀɴɪᴄ ʀᴏᴜᴛᴇꜱ ᴛʜᴇ ꜱʜɪᴘ ꜰᴏʟʟᴏᴡ ᴛʜᴇ ɢʀᴇᴀᴛ ᴄɪʀᴄʟᴇ ʀᴏᴜᴛᴇꜱ ᴡʜɪᴄʜ ᴀʀᴇ ᴛʜᴇ ꜱʜᴏʀᴛᴇꜱᴛ ᴀɴᴅ ʙᴇɴᴇꜰɪᴄɪᴀʟ ᴛᴏ ꜱᴀᴠᴇ ꜰᴜᴇʟ ᴀɴᴅ ᴛɪᴍᴇ ,ᴏᴛʜᴇʀᴡɪꜱᴇ ᴛʜᴇ ᴢɪɢᴢᴀʜ ʀᴏᴜᴛᴇ ᴡᴏᴜʟᴅ ᴛᴀᴋᴇ ᴍᴏʀᴇ ꜰᴜᴇʟ ᴀɴᴅ ᴛɪᴍᴇ .