I heard that the Earth rotation is slowing down, but I also heard the Earth's length of day is increasing.
Does the two theories go together or conflict with each other?
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If you slow down, it will take you longer to type a sentence, won't it?
When the Earth slows down (i.e. the speed of rotation is decreasing), it will take longer to complete a rotation, so the day is longer (i.e. the length is increasing).