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Unformatted text preview: has changed many times during history, leading to many conventions. Transformation from on set of time coordinates to another is often referred to as “calendrical computations”. Current civil time ( UTC; Coordinated Unversal Time ) differs from TAI by an integer number of leap seconds to follow the traditional astronomical time (based on the “mean Sun”): UTC = TAI on January 1, 1958. This year (2009) another leap second has been added to adjust the UTC time. GPS time is yet another time convention used by the Global Positioning System: GPS time = TAI – 19s GPS time = UTC on January 6, 1980. MAE 146: Astronautics Introduction 2 Def: Types of model Origin BFV, 01/09/2009...
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- Winter '08
- Coordinated Universal Time, Universal Time, Leap second, Global Positioning System, atomic clock, International Atomic Time