In physics, an angle of depression means the angle between any two points on a surface that lies along different elevations. In graph paper, it is written as the angle between the x-axis and any point on a map. On a flat surface, the angle of depression indicates the horizontal direction and slope of the surface. For surfaces that are oriented orthogonally to each other, the angle of depression denotes the horizontal angle between the x-axis and any point on the map. In a two-dimensional coordinate system such as a sphere, the angle of depression defines the vertical angle between any two points on the surface. For spherical surfaces, the angle of depression defines the horizontal angle between any two points that lie along any axis of a sphere that revolves around the sphere.
In a two-dimensional coordinate system, the normal to the surface on which a point lies is called the horizontal angle of repose. It is the angle that separates the x-axis from the normal to the surface on which a point is placed. If the horizontal angle of repose is positive, then the point is higher or lower than the surface, but never nearer to or further from the x-axis than it is to the normal to the surface. If the angle of depression is negative, then the point is closer to the x-axis than it is to the normal to the surface but never closer to or higher than the surface.
A great many phenomena that science studies, including the relationship between gravity, surface tension, fluid dynamics, and electrodynamic equilibrium, are explained by working with the concept of the depression angle. Gravity pulls a sphere uniformly downward; the more uneven the surface, the greater the force of gravity pulls on the sphere. If the sphere is perfectly spherical, the centrifugal force of the spin would cause the sphere to move in a direction independent of gravity. If the sphere is slightly oblong instead of spherical, then the centrifugal force of the spin would cause the ball to move in an elliptical direction independent of gravity.
The angle of depression gives the magnitude of the tangent to be measured, also known as the tangent ratio. The tangent will always be less than zero, and the larger the difference between the tangent and zero, the smaller is the angle of depression. There is nothing complicated about calculating the tangent. Just plug in the given values into the tangent formula and divide by 2. That's all there is to it.
How to calculate the angle of depression The easiest way to calculate it is to use graph paper to plot the depression, height, right triangle, and left triangle. Next, determine where on the chart you want your point to be located, mark a point on the chart, and draw a line between that point and the top left (zero) value of the chart. This is where you can now calculate the angle of the circle that marks the intersection of the two lines. Plug in the values for the height and right triangle into the equation and determine if the point is above, below or at the intersection. You know, without a doubt, that the angle of the circle exactly matches the elevation.
What are the effects of these angles on a more in-depth discussion? By understanding the formulas, we can see why extreme depressions occur. For instance, if there is a slight slope in the terrain, this can greatly affect the angle of the depression. In addition, these points are important in determining the location of critical anomalies that may pose a hazard to pilots and engineers while they are in the air.
An interesting side note is that if an aircraft is descending fast, the angle of depression will be much smaller. It is for this reason that experienced pilots urge their new pilots to fly low enough to make an angle of depression smaller than zero degrees. It is not uncommon to see small angle of depression values around one degree for pilots just starting out. Such values will continue to decrease as they gain experience.
The final topic to discuss is the effect of sight on the angle of depression. When the airplane is flying straight down from a high altitude, the angle of view is nearly perfect. However, as the angle of attack increases, the angle of sight will become smaller. As the observer gets closer to the airport, the view will get smaller as well, but it will remain constant as long as the vertical distance from the airport is less than the width of the altitude window.
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