Name: 太陽の大きさは？ (How Big Is The Sun?)
Uploaded: 2021-01-14T10:19:35.000Z
Duration: 2 min 16 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

転換語

The Sun and the Moon are about the same size when you look at them in the sky, though that’s

程度の副詞

just thanks to the coincidence that the Sun is about 400 times farther away than the Moon

and also about 400 times bigger. Another fun coincidence is that the radius of the Sun

is about twice the distance to the moon, so if you put the sun where the Earth is,

the Moon would be just over halfway to the surface of the Sun.

The Sun is also so big that it takes light over 4 and a half seconds to travel across

its face – though I don't know whether that says more about how big the Sun is, or how

What about the scale of other solar system objects? Well, here are Pluto and Charon compared

And Jupiter; which, as a rough rule of thumb, has about 10 times the radius of the earth

Saturn is slightly smaller than Jupiter, though its rings go out twice as far – still only

Mars’ moons are very close and very small, which gives rise to another moon-sized coincidence:

Phobos is almost the same size in the martian sky as the Sun, and can cause annular eclipses

If two objects have the same apparent size in the sky, like the Moon and the Sun, it

means that their radii divided by their distances are about the same value. This also implies

that the strengths of the objects’ tidal forces, which are roughly proportional to

the radius over the distance cubed, will also be about the same. In fact, ANY two objects

of roughly the same density that look about the same size in the sky will have tidal forces

So while the apparent equal size of the moon and sun in our sky is a coincidence, the fact

that they have similar apparent sizes AND roughly similar effects on the tides is a

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太陽の大きさは？ (How Big Is The Sun?)

slightly

scale

consequence

coincidence