I've noticed that both LAX and YYZ have rwy 24 with headings of roughly 240 deg. I was playing around with Google Earth and I aligned GE to point 240 degrees using YYZ's 24R. Then I moved to LAX keeping GE aligned to 240 deg. To my surprise 24R at LAX was about 80 deg off the 240 deg alignment of YYZ's rwy 24R. Is this because of magnetic variation?Dave F.(hope I made sense)

Although the mag variation is a factor, I suspect in this case the translation errors are due to how Google Earth presents translation on the curved surface of the earth. An 80 deg difference in magnetic delination anyplace but near the magnetic poles would be a surprise.Runway heading and magnetic headings are just a rule of thumb. Note that at KLAX there are four parallel runways (6/24 and 7/25) but all four have the same true heading. Same for KATL and soon at KORD.