The diameter of Sirius A is about 1.71 times the diameter of the Sun. Selected basis: approximate values.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
1,391,000 km - Diameter; approximate.
The Sun is the star at the centre of the Solar System. Its light and heat power most life and weather on Earth.
Our star, modelled with the IAU nominal solar radius. “Surface” means the visible photosphere. The core is much hotter; this is not a solid surface.
IAU — nominal solar and planetary conversion constants2,379,000 km - Diameter; rounded model.
Sirius A is the brighter main-sequence star in the Sirius binary system.
A rounded main-sequence star model for the brighter member of Sirius.
Defined examples — our methodology
There’s always another scale
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.
SpaceSirius A2,379,000 kmSirius A is the brighter main-sequence star in the Sirius binary system.
SpaceEarth12,740 kmEarth is the rocky planet on which we live and the third planet from the Sun.
SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.SpaceNeutron star20 kmA neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.
SpaceEarth–Sun distance1 AUThe Earth–Sun distance, or astronomical unit, is the standard measure of separation between Earth and the Sun used in astronomy.Side by side
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scaleGot a good eye for scale?