Explanation: Longitude lines are a fundamental part of the geographic coordinate system used to specify the precise location of a point on the Earth's surface. These lines run from the North Pole to the South Pole and are perpendicular to the equator. The Prime Meridian, which is 0$^\circ$ longitude, passes through the Royal Observatory in Greenwich, England, and serves as the reference point for measuring longitude.
In the context of India, the westernmost longitude is a significant geographical feature that defines the western boundary of the country. This longitude is located in the state of Gujarat, which is situated on the western coast of India, bordering the Arabian Sea. The exact coordinates of this point are 68$^\circ$7'E, which is the farthest west point of India's mainland.
Understanding the concept of longitude is crucial for various applications, including navigation, mapping, and time zone calculations. The longitude lines are spaced 15$^\circ$ apart, corresponding to one hour of time difference. Therefore, the westernmost longitude of India at 68$^\circ$7'E is an important reference point for determining the time and location within the country.
It is important to note that the westernmost longitude of India is not to be confused with the easternmost longitude, which is located in Arunachal Pradesh at approximately 97$^\circ$25'E. The difference between these two longitudes spans the entire width of India, highlighting the vast geographical expanse of the country.
In summary, the westernmost longitude of India is 68$^\circ$7'E, located in Gujarat. This is a critical geographical coordinate that helps in understanding the spatial distribution and boundaries of the country.