05JUL21

Equator is the imaginary horizontal line around the middle of Earth.

Prime Meridian, also called the Greenwich Longitude, is the imaginary vertical line around the middle of Earth.

When it's 5:30 a.m. in India, it's 2 a.m. in Sweden and it's still midnight in London.

Equator and Prime Meridian are like the X-Axis and Y-Axis in math.

X and Y Axes are at right angles to each other and their point of intersection is called the Origin.

Up, down, right and left are similar to north, south, east and west respectively.

X and Y Axes divide a plane into 4 parts called quadrants ordered anti-clockwise. The four quadrants may be likened to northeast, northwest, southwest and southeast respectively.

The quadrants make up the Cartesian Plane.

The Origin is a point which has 0 dimension. The two axes are lines which have 1 dimension called 'length'. The plane has two dimensions namely length and breadth.

The part of X-Axis to the right of the Origin is called the positive X-Axis and the part to the left of the Origin is called the negative X-Axis.

The part of Y-Axis above the Origin is called the positive Y-Axis and the part below the Origin is called the negative Y-Axis.

In the first quadrant, both coordinates are positive. In the third quadrant, both coordinates are negative.

In the second quadrant, the first coordinate is negative and the second is positive. In the fourth quadrant, the first coordinate is positive and the second is negative.

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