Question

number of points having the same set of latitude and longitude

Answer 1

IT IS CALLED THE 180 MERIDIAN

AND ALSO KNOWN ASINTERNATIONAL DATE LINE

Therefore, the total number of longitudes is 180+180+1–1 (180 west longitudes, 180 east longitudes, -1 because 180E and 180W are the same longitude, +1 for 0degree longitude - the prime meridian) = 360.