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.
A circle of latitude on Earth is an abstract eastâwest circle connecting all locations around Earth at a given latitude. Circles of latitude are often called parallels because they are parallel to each other; that is, any two circles are always the same distance apart. A location's position along a circle of latitude is given by its longitude. Circles of latitude are unlike circles of longitude, which are all great circles with the centre of Earth in the middle, as the circles of latitude ...