The parallel of zero latitude, called the 'equator'.
The line of zero latitude does that. Folks often call that one the 'Equator'.
There are three lines of latitude that cross India. The one in between the two halves is the 80th meridian east, 80° east of Greenwich. The 90° and 70° lines also cross India.
a bisecting line is a line that divides something into halves.
Every line bisector divides a line into two halves: by definition!
a line
It is called a great circle. The equator is an example.
That line is called a "Diameter".
equator
The Equator...
diameter
To bisect is to cut or divide into halves. A bisecting line would then be a line that divides another line in half or a line that divides an angle in half.
A line of symmetry divides a figure into two matching halves.