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1. PERSPECTIVE. The horizon is not an objective physical phenomenon at all, but rather a subjective optical phenomenon based on an individual observer's perspective. If the horizon was actually the objective physical curvature of a globe, then objects receding beyond it could not be zoomed back into view, and it would remain fixed as an observer ascended. In reality, however, the horizon rises along with the observer no matter how high, and modern zoom technology can bring objects receding beyond it back into full view. This proves the horizon line is not some objective point of curvature on a convex Earth, but rather the subjective vanishing line of perspective from a given observer's point of view.
2. ARTIFICIAL HORIZON INDICATORS. If Earth was truly a sphere, by simply flying level, aeroplane artificial horizon indicators should show a steady decline unless pilots constantly correct their altitudes downwards so as not to fly straight off into so-called "outer-space." For example, a pilot travelling 500mph over a globe Earth 24,900 miles in circumference would have to descend an average of 2,777 feet, or over half a mile per minute, otherwise in one hour's time the plane would be 31.5 miles higher than desired. In fact, if Earth was really a ball, there should be no reason to use rockets for flying into "outer-space" because simply flying an aeroplane straight at any altitude for long enough would already inevitably send you there.
3. PLANE SAILING. Both Plane Sailing and Great Circle Sailing, the most popular navigation methods, use plane, not spherical trigonometry, making all mathematical calculations on the assumption that the Earth is perfectly flat. If the Earth were in fact a sphere, such an errant assumption would lead to constant glaring inaccuracies. Plane Sailing has worked perfectly fine in both theory and practice for thousands of years, however, and plane trigonometry has time and again proven more accurate than spherical trigonometry in determining distances across the oceans. It is so commonly used at sea "Navigation in Theory and Practice," states that "In practice, scarcely any other rules are used but those derived from plane sailing. The great and serious objection to plane sailing is that longitude cannot be found by it accurately, although in practice, it is more frequently found by it than any other method." So, both latitude and longitude are found most often and most accurately by assuming Earth to be flat, more accurately even than assuming the Earth to be spherical.
4. DATUM LINES. If Earth was actually a globe of given proportions, builders would find themselves constantly deviating from both their established vertical and horizontal datum lines, but in reality, canals, railways, bridges, tunnels and other large projects are always cut and laid horizontally, often over hundreds of miles, without any allowance for curvature and no deviation from the established datum. As stated by surveyor T. Westwood in Earth Review magazine, "In levelling, I work from ordinance marks, or canal levels, to get the height above sea level. The puzzle to me used to be, that over several miles each level was and is treated throughout its whole length as the same level from end to end; not the least allowance being made for curvature."
5. SUEZ CANAL. The Suez Canal is over 100 miles long and without any locks so the water within is an uninterrupted continuation of the Mediterranean Sea to the Red Sea. When it was constructed, the Earth's supposed curvature was not taken into account, it was dug along a horizontal datum line 26 feet below sea-level, passing through several lakes from one sea to the other, with the datum line and the water's surface running perfectly parallel over the 100 miles. Another good example is the Dunyang-Kunshan Bridge, the longest bridge in the world just over 102 miles long, which runs parallel to the Yangtze river and connects the Shanghai and Nanjing provinces. This bridge is approximately the same length as the Suez Canal and was also built without factoring the alleged curvature of the Earth.
6. ENGINEER COMMENTS. Engineer W. Winckler was published in the Earth Review regarding the use of spherical trigonometric allowances for the Earth’s supposed curvature, stating, "As an engineer of many years standing, I saw that this absurd allowance is only permitted in school books. No engineer would dream of allowing anything of the kind. I have projected many miles of railways and many more of canals and the allowance has not even been thought of, much less allowed for. This allowance for curvature means this: that it is 8" for the first mile of a canal, and increasing at the ratio by the square of the distance in miles; thus a small navigable canal for boats, say 30 miles long, will have, by the above rule an allowance for curvature of 600 feet. Think of that and then please credit engineers as not being quite such fools. Nothing of the sort is allowed. We no more think of allowing 600 feet for a line of 30 miles of railway or canal, than of wasting our time trying to square the circle."
7. RAILWAYS. The London & Northwestern Railway forms a straight line 180 miles long between London & Liverpool. The railway’s highest point, midway at Birmingham Station, is only 240 feet above the datum line known as ‘sea level’, but if the Earth was actually a globe of given proportions, the 180 mile stretch of rail would form an arc with its centre point at Birmingham raising over a mile, a full 5,400 feet, above London & Liverpool.
8. FARSIGHT. It is often possible to see the Chicago skyline from sea-level 60 miles away across Lake Michigan. In 2015 after photographer Joshua Nowicki photographed this phenomenon several news channels quickly claimed his picture to be a “superior mirage”, an atmospheric anomaly caused by a temperature inversion. While these certainly do occur, the skyline in question was facing the right way up & was clearly seen, unlike the upside-down, hazy illusory image of a mirage. The actual skyline, on a spherical Earth 24,900 miles in circumference, should be a full 2,400 feet below the horizon. In Genoa, Italy, from only 70 feet above sea level, on clear days it is possible to see the distant islands of Elba, Gorgona, Capraia & Corsica which are 81, 99, 102 & 125 miles away respectively. If Earth were truly a globe of the given proportions, all four islands could never be visible for such an observer and would be hidden behind 3,300, 5,200, 5,600 & 8,700 feet of curved water respectively.
FLAT EARTH FAQ, ERIC DUBAY