where is its exact location?
It is not truly fixed; the true equatorial plane is perpendicular to the Earth's rotation axis, which drifts about during a year.
Equator
The precise location of the equator is not truly fixed; the true equatorial plane is perpendicular to the Earth's rotation axis, which drifts about during a year. 
we would expect what with low pressure in the northern hemisphere Large polar cyclones what is this aforesaid area? It is the half of Earth that is north of the Equator. what is this last mentioned thing? It is a specific case of a planetary equator. It is about long, of which 78.8% lies across water and 21.3% over land. where did it take its name from? From medieval Latin word "aequator"
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Equator [SEP] Precise location
The precise location of the equator is not truly fixed; the true equatorial plane is perpendicular to the Earth's rotation axis, which drifts about during a year. This effect must be accounted for in detailed geophysical measurements. Geological samples show the equator significantly changed positions between 12 and 48 million years ago, as sediment deposited by ocean thermal currents at the equator have shifted. The deposits by thermal currents are determined by the axis of the earth, which determines solar coverage of the Earth's surface. Changes in Earth axis can also be observed in the geographic layout of volcanic island chains, which are created by shifting hot spots under the Earth's crust as the axis and crust move.