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What is Twilight , its types in detail?

Twilight is the period of incomplete darkness before sunrise and after the sunset. So the morning twilight ends at sunrise, when the upper limb of the sun just appears above the visible horizon, and evening twilight starts at...

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What are Errors  Of  GPS System?

GDOP(Geometric Dilution of Precision) The idea of Geometric DOP is to state how errors in the measurement will affect the final state estimation.  Geometric Dilution of Precision  Estimate of satellite conditions for a given...

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