The earth is spherical and for every sphere there is a diameter. I don`t believe that any country or region should be called the center of the earth.
For instance if you hold a ball and cut it in half, then the middle of that ball is the center. Because the earth rotates, The time in which this division of the earth happens theoretically is the center of the earth at that time. So different times of the day will give different centers of the earth.
The current model of an expanding universe means we can go in any direction and eventually get home; so just point and you are likely right.
The centre of the galaxy is easier.
There isn’t really a “centre” to our universe – the universe began with the big bang, and has been constantly expanding ever since. However, rather than expanding outwards (like ripples from a stone thrown into a pond), it is the same everywhere – the universe is not expanding from a single point outwards, but rather it is expanding equally in all places, as far as we know.
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