For the earth to make a full rotation on its axis.
The average distance from the sun to Earth
Explanation:
- Astronomical unit is defined as the the average distance from the center of the earth to the center of the sun.
- It is represented by AU.
- The value is equal to a unit of measurement of 149.6 million kilometers.
- An Astronomical Unit is approximately equal to 93 million miles (150 million km). It's approximately 8 light-minutes.
- Astronomical units are usually used to measure distances in solar system.
Chimneys are typically vertical, or as near as possible to vertical, to ensure that the gases flow smoothly, drawing air into the combustion in what is known as the stack, or chimney effect.
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