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What is an absolute magnitude?

What is an absolute magnitude? Here are some definitions.

Noun
  1. (astronomy) The intrinsic luminosity that a celestial body would have if viewed from a distance of 10 parsecs or 32.6 light years.
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For instance, in electromagnetism the difference in electrical potentials is relevant but not its absolute magnitude.
The absolute magnitude, M, is defined as the apparent magnitude a star would have if it were placed 10 parsecs from the Sun.
From the time period, determine the star's actual brightness, also called the absolute magnitude.
To estimate absolute magnitude of these processes, it is necessary to quantify all source and sink terms precisely.
The absolute magnitude of drawdowns or redeposits is not meaningful in terms of understanding what monetary policy is doing.
It is the absolute magnitude of the amount of taxpayer money involved in these programs.

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