Parallax is the method that astronomers use to measure the distance from the sun to the earth.
The unit used is usually the Astronomical Unit (AU), which is the average distance from the earth to the sun, and is approx 150 million km.
Light year is used to measure the stellar distances whereas miles and km is used to measure distance on Earth.
light years
Many options are used.MilesKilometers.Light minutesAU
Laser
parallax
This is called PARALLAX.
AU is not used to measure the distances on earth, because a astronomical unit is a unit of measurement equal to the distance between Earth and Sun. So that's why you cannot use Au for measure the distances on Earth.
The Earth is about 93,000,000 miles away from the Sun. To be exact, it is 92,955,807.27 miles away. An AU, or Astronomical Unit, is used by astronomers to represent the mean distance from the Earth to the Sun.
they transmit radio wave frequency to space and check for the their return or reflecting time , same as that used to calculate speed of light, for calculating the distance of galaxy. if the return radio frequency has increased, then they are moving closer to earth and vice versa. thank you
Light year is used to measure the stellar distances whereas miles and km is used to measure distance on Earth.
To measure the distance on the Earth's surface North or South of the Equator.