Absolute Scale Based On Vega
The star Vega has been defined as having a magnitude of zero, or at least near. Modern instruments such as bolometers and radiometers give Vega a brightness of about 0.03. The brightest star, Sirius, has a magnitude of −1.46. or −1.5. However, Vega has been found to vary in brightness, and other standards have been proposed.
Read more about this topic: Magnitude (astronomy)
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