depends who's measuring and which star. it is a matter of preference.
1. kilometers/miles - relatively nearby star like our sun
2. lightyears - near-medium star like the nearest star except the sun
3. parsecs - medium-far star
4. megaparsecs - very far star
there are some others but they are not the usual ones
You can use any unit of length; light-years and parsecs are often used in practice.
You can use any unit of length; light-years and parsecs are often used in practice.
You can use any unit of length; light-years and parsecs are often used in practice.
You can use any unit of length; light-years and parsecs are often used in practice.
There are two techniques that are both fairly basic; one is more accurate for nearer stars, while the other is much less accurate.
The first method is measuring the stellar parallax shift. Observe a relatively close star (within about 300 light years or so) and compare the positions of the distant background stars. Do this when the star is nearly overhead at dawn. Wait six months so that the same star is nearly overhead at sunset, and measure the shift in the star's position relative to the background stars. With careful measurement, you can measure the shift in the positions of the background stars in fractions of a second of arc.
For a star that has a parallax shift of one second of arc, we define the distance to that star as one "PARallax SECond of arc", or one "PARSEC". This is approximately equal to 3.1 light years away.
We can also measure the brightness of these stars, and measure their color; the color gives us some idea of how bright the star REALLY is, and we compare our calculated brightness to the measured brightness, and we can make some good guesses as to how far away the star must be to appear that dim or bright.
Stars are measured in units called light-years
You can use any unit of length; light-years and parsecs are often used in practice.
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.
The four units that distance can be measured in are . . .inchesmetersyardskilometersmilescentimetersfeetparsecsmillimetersfurlongsastronomical unitsnanometersSmootsleagueslight yearsThere are also some others.
Interplanetary distances are measured in either kilometers or in miles. For the distant planets, some measures are measured in Astronomical Units, where one AU is the distance between the Sun and the Earth. So, 1 AU = 93,000,000 miles.
resistance
According to me, there are many units of distance given by S.I units .The longest unit of distance is light years and after that it is miles.
That's the star's "azimuth".
That's the star's "azimuth".
That's the star's "azimuth".
light years
The distance to a star.
That's referred to as the star's "declination".
It's measured in light-years (or parsecs) which is trillions of miles.
It's measured in light-years (or parsecs) which is trillions of miles.
Distance from the Equator is measured in Latitude .
You can conclude that it is farther than a certain distance. How much this distance is depends, of course, on how accurately the parallax angle can be measured.
Distance is measured in kilometres, such as the distance between two towns, or the distance from the Earth to the Moon.
Three factors that affect a star's brightness are the star's distance from earth, its age and its luminosity. The farther the star is from earth, the less bright it appears. As a star increases in age, its brightness also increases. Its brightness also depends on its luminosity, which is the amount of energy the star emits per second.