# How do we know that distance between earth and sun is 1 astronomical unit ?

The Astronomical Unit (AU) is based on the average distance of the Earth from the Sun.

The average of the Earth's perihelion and aphelion distances was established as the definition of the Astronomical Unit.

Since then, the Astronomical Unit—which has an exact value of 149,597,870.7 meters—has evolved into an international SI unit.

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The distance between the Earth and the Sun is defined as 1 astronomical unit (AU). This value was determined through centuries of astronomical observations and calculations, including measurements of the Earth's orbit around the Sun, triangulation using the positions of other celestial objects, and advancements in techniques such as radar and spacecraft telemetry.

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The distance between the Earth and the Sun is defined as 1 astronomical unit (AU). This unit is based on the average distance from the Earth to the Sun, which is approximately 149.6 million kilometers (about 93 million miles). This value has been established through extensive astronomical observations and measurements over time, including techniques such as radar ranging, triangulation, and celestial mechanics calculations.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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