The length is called the astronomical unit.
Parallax is the method that astronomers use to measure the distance from the sun to the earth.
Many options are used.MilesKilometers.Light minutesAU
optical pyrometerA special type of technique is used to measure very high temperatures such as the Sun. A Bolometer is the instrument used to measure the Suns temperature. The Bolometer measures in colors, and the Sun emits temperatures in colors. This technique is based on a law called Wien's Law.
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.
Planet Saturn is 9.5 au's away from the sun. An au is astronomical unit used to measure distances from a planet to the sun.
shorter
Back before Astronomy was well-understood, people used the "Apparent" motion of the Sun across the sky as the measure of the length of the day. Now that we know better, we measure the length of a day as one complete rotation of the Earth. This is known as a sidereal day (sigh-deer-ee-al) which is approximately 23 hours, 56 minutes, 4.09 seconds, corresponding to the time it takes for the Earth to complete one rotation with reference to the vernal equinox.
A revolution of the Earth around the Sun.
This question was deemed null by Copernicus's Heliocentric theory, whereby stating that the sun is the center of our solar system. Thus, we cannot measure the length of a year of the sun, because the sun does not rotate around the Earth, which is the definition of a "year." One can, however, measure how long a "day" on the sun lasts by measuring its rotational velocity.(THE SUN DOESN'T HAVE A YEAR BECAUSE IT DOESN'T ORBIT ANYTHING!!!)
Distance is a measure of length, grams is a measure of weight.
The astronomical unit (or au) is a unit of length, roughly the distance from Earth to the Sun. As the Earth/Sun distance varies the unit has been "fixed" at as exactly 149,597,870,700 metres (about 93 million miles)This may seem big but in terms of the universe it is pretty small. As a result it is used to measure distances in the solar system.
Earth's tilt relative to the sun and Earth's position in its orbit around the sun.