# How do we know the diameter of the sun?

From angular spacing of the solar disc and observer's distance from Sun. The formula is diameter = 2 X (sun distance) X tan (angular spacing of solar disc/2)

If two of these data are known, the formula approximates the third. Observer distance = Sun-distance - radius of Earth = 149591884 km, nearly. Angular spacing of diameter of solar disc = 0.5334 deg, nearly. Consequently, the diameter from the formula is 1392684 km.

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The diameter of the Sun is determined through various methods, including geometric calculations, solar observations, and indirect measurements using astronomical techniques such as parallax and helioseismology. Geometrically, the Sun's diameter can be inferred from its angular size as observed from Earth. Direct solar observations using specialized instruments such as solar telescopes and coronagraphs also contribute to determining its diameter. Additionally, helioseismology studies the Sun's internal oscillations to indirectly estimate its size.

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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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