![]() ![]() but its only if you fly against earth’s rotation. so one minute of flight at ground level vs one minute of flight at altitude results in greater distance. but what this really does is multiply the distance you travel at altitude relative to the ground. or vice versa, you can say the ground it traveling quicker as well since two point in the circumference have less distance to travel compared to the greater altitude. at a great altitude, though you are traveling at a perceived pace relative to the motor function, but you are multiplying that velocity by the increase in circumference relative to the ground’s. this means that at greater radius per starting location, the rotational velocity of a shorter radius vs a larger are varied. the length of a circumference increases by 2 pi r. what matters is the velocity the earth rotates at. it doesn’t matter if these lines are curved or not. then draw two lines, one at altitude and the other at ground level. if you draw two lines from the center of a circle, each come out of the destinations. ![]() the real reason is because of difference of rotational velocity of a shorter vs longer circumference. Maybe thats how they conclude it but its wrong, even if it works. If the earth were flat then for positioning on it there would be only one angle from the centre and a linear distance measurement from it… an idea that has never ever been tried and proven. I’ll finish with a reminder that latitude and longitude are both angular measurements derived from the centre of the global earth mass. I’ve personally used latitude and longitude to circumnavigate the earth 5 times. The first circumnavigation of the earth was accomplished by the Magellan fleet sailing westward 500 years ago. Early mariners setting off on long voyages either came ‘back’ or never returned which for millenniums gave rise to the flat earth notion. Around that time there were early attempts to measure the circumference of the global earth. These days we all take degrees latitude and degrees longitude for granted because they have been successfully used for over 2,000 years. In the modern era all of these positioning problems have been overcome by GPS satellite navigation. A simple solution is, where possible, create a sequence of short rhumb lines along the corresponding great circle route. For aviation the distance is more critical since it directly affects time, fuel and load. For short distances the difference between the rhumb line and great circle route is negligible. Such a course, known as a rhumb line, is preferred in marine navigation because it is easier for a ship to sail in a constant compass direction to reach its destination even though it will be a bit further than a great circle route. However, the distance measured between two latitudes on the same longitude is the same distance on other longitudes because they will lie on a great circle.įor marine navigation the map solution generally accepted is the Mercator projection because of its unique property of representing any course of constant bearing as a straight segment that can easily be drawn on a flat map. ![]() On the surface of global earth the horizontal distance measured between two meridians along the equator (0 degrees latitude) will be greater than the distance between the same two meridians measured along any other latitude because the circumference of each latitude gets smaller toward the poles so the meridians are closer together near the poles. When you try to draw a flat map to depict the surface of a globe there is a huge problem imagine taking the peel off of an orange and trying to lay it out flat. 0 degrees latitude, 0 degrees longitude is the intersection of the prime meridian and the equator (just south of Ghana West Africa). Both of these angular measurements are derived from the centre of the global earth mass. Longitude is the angle east or west of the prime meridian (ie the Greenwich Meridian). In navigation latitude is the angle above (north) or below (south) of the equator. ![]()
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