Write an article based on this "Calculate the actual distance you'd have to traverse to get to the horizon by using the following formula. Increase R by 20% to compensate for the distorting refraction of light rays and to arrive at a more accurate measurement. Understand how this calculation works."
article: d = R * arccos(R/(R + h)), where d = distance to horizon R = radius of the Earth h = height of eye The geometric horizon calculated using the method in this article may not be the same as the optical horizon, which is what your eye actually sees. Why is this? The atmosphere bends (refracts) light that is traveling horizontally. What this usually means is that a ray of light is able to slightly follow the curvature of the earth, so that the optical horizon is a bit further away than the geometric horizon. Unfortunately the refraction due to the atmosphere is neither constant nor predictable, as it depends on the change of temperature with height. There is therefore no simple way to add a correction to the formula for the geometric horizon, though one may achieve an "average" correction by assuming a radius for the earth that is a bit greater than the true radius. This will calculate the length of the curved line that follows from your feet to the true horizon (shown in green in this image). Now, the arccos(R/(R+h)) portion refers to the angle that is made at the center of the Earth by the line going from the true horizon to the center and the line going from you to the center. With this angle, we multiply it by R to get the "arc length," which, in this case, is the distance that you are looking for.

Write an article based on this "Draw a horizontal line inside the circle from one edge to the other. Label the points where the line crosses the circle points "A" and "B. Draw two overlapping circles, one using A as the center and the other using B as the center. Draw a vertical line through the two points at which the outer circles intersect. Measure the diameter."
article: Use a ruler or a straight edge to do this. It can be at the top, near the bottom, or anywhere in between. " Be sure the two circles overlap like a Venn diagram. This line marks the diameter of the circle4. Measure it using a ruler, or for greater accuracy, a pair of digital calipers. You're done!

Write an article based on this "Shut off the power to the air conditioner. Take the air conditioner out of the window (when applicable). Trim foliage so it isn't closer than 2 feet (0.6 meters) to the unit. Remove the cover from the air conditioner unit. Pull the cover and fan from the unit (when applicable)."
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Most outdoor air conditioning units have an appliance shut off box situated nearby. Open the door on the box and flip the switch or remove the fuse to cut power to the air conditioner. Window and wall units can usually just be unplugged. If you have no shut off box, turn off the power at the circuit breaker in your house. Never attempt to work on an air conditioning unit without first disconnecting the power. Window units can usually be cleaned just like central air units, but the coils will be easier to access if you remove the unit from the window before you start working on it. The layout of window units is different than indoor or outdoor central air units, but the functions and parts are effectively the same. Be sure to lay the air conditioner on a flat surface, preferably outdoors, for cleaning. As the seasons change and leaves fall from trees, they can collect on the air conditioning unit or even slip inside through the heat dissipation vents. Once you've trimmed the branches and bushes, be sure to clear the entire area around the unit. Loose leaves and dirt surrounding your air conditioning unit can be blown through the vents, collecting around the coils and limiting how effective they can be. Cleaning the area of debris and foliage will also improve airflow into the air conditioning unit. Be sure to wear safety glasses and gloves when trimming trees and bushes. Depending on your air conditioner, you will need either an appropriately sized socket or a screwdriver to remove the bolts or screws securing the cover in place. Once you have them removed, pull the lid off of the air conditioning unit. The user manual will tell you what size socket or screwdriver you need. Set the screws aside somewhere safe. Some air conditioning units will have a grill with a fan attached to it mounted on the top. Remove the screws and pull the grill out from the top of the open unit. The fan is usually attached, so be sure to support it as you remove the assembly to avoid letting it hang by its electrical connections. In air conditioners where the fan stays in place, avoid spraying it directly with water as you clean.