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It is amazing when you think about the coincidence that our Sun is almost 400

times larger in diameter than our moon and it's also 400 times further away.

This gives an almost perfect fit for a total solar eclipse. But is there any

other planet whose moons also perfectly fit over Sun, or we are just the lucky ones.

According to a study based on 141 moons whose sizes and orbits are known, it

is founded that about 32 moons can hide sun's disk completely when seen from their planet's

surface. Many of these moons are extreme. Pluto's

Charon, which looms about two hundred times larger then Sun in Pluto's sky. Next

is Neptune's Titrion, which is about 27 times larger than Sun in Neptune's sky.

Other wooping big moons include Neptune's Dispina ,which is about 70

times larger and the Uranus's Arial which is about 15 times larger.

Jupiter's Galilean moon Callisto can also appear one point three times larger than

Sun when low in Jovian sky. The only moons that seem to be capable of a

near perfect fit like our moon, are Saturn's moons - Epimethius

Prometheus and Pandora. Each of these has irregular shapes. So a total solar eclipse

by any one of them is not likely to show Sun's corona all its glory. Neither

they did will show the beautiful array of prominences nor the diamond ring

effect as we often behold from Earth. Many other modes

in our solar system would always appear smaller then the sun's disk. Although, the size of

Neptune's Nereid is still poorly known, when near the low point of

its highly elongated orbit it might cover up to 80% of sun's diameter.

Mars's Phobos is wide enough to span 69% of Sun's diameter when Mars is

at its aphelion. But it will stay for less than 10 seconds as this tiny moon glide by.

So, yes we're the lucky one.

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