A sun dial works by casting a shadow that is determined by the sun's position in the sky. Sun dials come in a variety of styles and shapes. Cheap, mass-produced sun dials often have design flaws that prevent them from accurately showing the time.Know More
Locate true north. This is different from compass north, which is affected by the Earth's magnetic pole. GPS systems have a setting for true north. A combination analemmatic-horizontal sun dial is self-orienting. You stick a pin in today's date and turn it so that both sundials show the same time.
Solar time and standard time may be as much as 16 minutes apart because the number of hours of sunlight varies while the length of a day is always 24 hours. You can adjust solar time to standard time by consulting the Equation of Time chart, which is included with some sun dials.
Look for the edge of the shadow that's furthest from the gnomon (pronounced no-mon). This shadow line should be straight from the center of the sun dial to the periphery. If the time is near solar noon, there may be a bend in the line. In this case, use the outermost part of the shadow. Morning times appear on the left side of the center meridian, while afternoon hours are on the right.
A mechanical temperature gauge uses a Bourdon tube filled with temperature-sensitive liquid to indicate temperature, while an electrical model uses a variable-resistance unit that varies current to the dial as temperatures change. Most modern vehicles use electrical gauges as the mechanical versions are sensitive and expensive to replace.Full Answer >
Mars is the fourth planet from the sun and the seventh largest at 227,940,000 kilometers, according to the University of Central Florida. The size and close proximity of Mars render it visible in the night sky, especially at certain points during its orbit.Full Answer >
Relative to its planets, the sun is actually a stationary body, but it appears to move due to Earth's rotation. However, it is important to recognize that nothing is ever truly stationary.Full Answer >
To convert 7 p.m. Greenwich Mean Time to Eastern Standard Time, subtract five hours from 7 p.m. The result shows that when it is 7 p.m. GMT, it is 2 p.m. EST. Keep in mind that in countries where Daylight Standard Time is used during the summer months, the difference is only four hours while DST is in effect.Full Answer >