Addresses are coordinates within the system (similar to latitude and longitude). The Esplanade at (NAD83) latitude/longitude . Knowledge of both latitude and longitude was required. The first rigorous system of latitude and longitude lines is credited to Hipparchus. He developed a system of latitude and longitude. In considering temperature, location in terms of latitude and longitude is not a significant factor. The grid formed by lines of latitude and longitude is known as a "graticule". Each place always has a longitude and a latitude. Two levels of abstraction are employed in the definition of latitude and longitude. Right ascension is the celestial equivalent of terrestrial longitude. It is located at 93.5 degree East longitude. It is located at 74 degree East longitude. This is the standard convention for geographic longitude. Most maps show the lines of longitude. It is common to both east longitude and west longitude.