The brightness of stars as they appear from Earth is measured by magnitude?
It is measured by apparent magnitude.
No, that's the Apparent magnitude you are thinking of. Stars that are closer to Earth appear to be brighter. The Absolute magnitude of a star is the brightness as it would be measured from a fixed distance of 10 parsecs away from it. Since we can't travel there to measure that, we have to calculate that from its estimated distance and its apparent brightness.
we cannot measure the brightness directly. The light reaching the earth is studied and measured. It is again not measured by energy measuring instrument. The magnitude of the light reaching the earth is measured by a scale proably called apparent magnitude. also known as "stellate magnitude" (Times 898 - 49 across)
Stars are classified by four different characteristics. Apparent magnitude (brightness) and absolute magnitude (how bright it would appear at 10 parsecs from the earth). Luminosity, another measure of brightness, compares the star to the sun's brightness. Spectral classifications are measured by the star's temperatures. Finally stars are signed a number by scientists through the Morgan-Keenan System.
A star's brightness is the brightness seen by humans on Earth. A star's brightness is its actual brightness and does not depend on where the star is viewed from.?
The apparent brightness of a star is measured by its apparent magnitude, which is the brightness of a star with respect to the star's luminosity, distance from Earth, and the altering of the star's light as it passes through Earth's atmosphere. Intrinsic or absolute magnitude is what the apparent magnitude a star would be if the distance between the Earth and the star were 10 parsecs (32.6 light-years), and it is directly related to a…
Star brightness is defined in terms of apparent magnitude, which is how bright the star appears from Earth. Star brightness is also defined by absolute magnitude, which is how bright a star appears at the standard distance of 36.2 light years. Luminosity is also a way that a star's light is measured.