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B-V to U-B colour index

Is there a formula to convert the B-V index to U-B index or are they totally different and separate observations and can't be convert like you can with Fahrenheit->Celsius? (Updated) I know F->…
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Apparent horizon

Apparent horizon Astronomy dictionary, letter H It is defined as an apparent horizon at a maximum circumference obtained by passing a plane tangent to the place of observation until the celestial sphere is found. While the visible horizon is defined by the separation between heaven and earth, the apparent horizon is an imaginary line.
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