impact of tall building on day and night duration?

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  • impact of tall building on day and night duration?


Answer #1 | 23/12 2013 08:00
It has zero impact. Day and night duration is determined by the rotation of the earth, a building has no effect on that. Perhaps you mean that the tall building changes the moment of inertial of the earth, which changes the rotation? but that number is too small to measure. And you would need to know where all the materials used in the construction came from. If the net is that the granite used came from high in a mountain, the moment of inertia could be decreased instead of increased. A larger change is due to the tons of meteorites that fall to earth every day, and yet that is also too small to measure.
Answer #2 | 23/12 2013 08:51
Maybe you mean the apparent duration of daylight for observers at the top of a tall building. For the sake of argument, let's say the building is at the equator and is 100 m in height. Arccos(6378/6378.1) is about 0.32 degrees, and keep in mind that the earth rotates 15 degrees per hour; so at the equinox the building's height would "postpone" sunset by about 80 seconds (of time) for observers inside the top of the building. This makes sense if you've driven along among hills, where you see sunshine on hilltops for a minute or two after it disappears from the vehicles and trees on the roadways (even when you're not in the shadow of a hill).
Answer #3 | 23/12 2013 09:06

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