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.
Geographers use Ptolemyâs calculations to create Lines of Latitude and Lines of Longitude. Lines of Latitude are imaginary lines that circle the globe from east to west. Lines of Latitude are called parallels because the lines parallel, or run in the same direction as the equator. The equator is the imaginary line that is as far away from the North Pole as it is from the South Pole. Lines of Longitude intersect the equator at right angles but end at the North and the South Poles. Lines of Longitude are also called meridians. Meridian comes from a Latin word that means midday.