Defunct first-party. 1  Aces Studio â Microsoft Flight Simulator series. 2  Digital Anvil â Brute Force, Freelancer. 3  Ensemble Studios â Age of Empires series, Halo Wars. 4  FASA Studio â MechWarrior series, Shadowrun. 5  Hired Gun â Halo 2 for Windows Vista. 6  Lionhead Studios â Fable series, Black & White series.
The term meridiangenerally refers to any line that runs pole to pole, on the surface of a sphere. Figure 2a (left): The Earth's coordinate system, latitude and longitude. The central axis runs through the North and South poles. Figure 2b (right): The pole-to-pole lines along the surface are lines of longitude.
The world is divided into four hemispheres based on lines of latitude and longitude. The equator is an imaginary line that is equidistant from the North and South Poles. This line falls at zero degrees latitude. The part of the Earth that is north of the equator is known as the Northern Hemisphere. The part of the Earth that is south of the equator is known as the Southern Hemisphere. The Western and Eastern Hemisphere are divided by zero degrees longitude which is known as the Prime Meridian.