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Why do the sun and moon appear to be the same size?

It’s fairly safe to say that we all know that the sun is much larger when compared to the moon. However, when viewed from Earth, the sun and moon appear to be approximately similar sized.

The reason for this is that the sun is roughly 400 times larger than the moon, while at the same time being roughly 400 times farther away. As a result, the sun seems to be of the same size as the moon.

But isn’t it a strange coincidence that the sun is 400 times larger and 400 times farther away? Is it just a coincidence or a thought-provoking question to ponder? You decide.

21 Answers

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  • 2 months ago
    Favorite Answer

    Yes, it is a thought provoking question, since the creator create all these things for mankind to realize, by using their intellect to understand that its intelligent designer create its with full perfection , with out any coincidence , ie the size and the distance of the moon and the sun is 400 times different , in order that when mankind look at the moon in the evening of the 15th day of the Luna month , especially, the late yesterday evening  , we saw the moon rising in the East is equal in size of the sun, while setting in the West, of having astronomical angle of both heavenly bodies, around 0.5 degree. Many thanks for your question that cause me to retrospect on the creation of the Supreme Creator, who create all things in heaven and earth and everything in between them with due proportion and balance ,for mankind to praise HIS Greatness, the Lord of all the worlds. This is my decide. 

  • Rita
    Lv 6
    2 months ago

    The sun and moon appear the same size in Earth's sky because the sun's diameter is about 400 times greater – but the sun is also about 400 times farther away.

  • garry
    Lv 6
    2 months ago

    why not , the earth spins around the sun , and the moon rotates around the earth ..funny how the sun is in the same position 28 days later !!!

  • 2 months ago

    Because the moon is about 239-thousand miles from earth and the sun is about  92-million miles from earth. As distance increases, an object subtends a smaller arc in the visual field. So at those distances they subtend about the same degrees of arc.

  • Anonymous
    2 months ago

    And isn't it strange we had oxygen, energy, nutrients, the right temperature and water to create  life.  And isn't it strange that the Moon at that exact distance and exact mass creates the only tide levels that could create tidal pools for all that life to be created.    And isn't it strange the planet Jupiter has the exact distance from Earth and exact mass to act as a giant vacuum cleaner and destroy any incoming threat.  And isn't it strange that the only question that can never be answered is why you know you are you.  There are dozens more.  All just an accident.

  • Anonymous
    2 months ago

    YOU THINKING ABOUT AN WAXING MOON?

  • 2 months ago

    I think its a coincidence - as it has not always been the case, and will not always be the case... the moon has been slowly moving out and away from Earth;  at this point in time, the sun & the moon appear to be the same size, but this will gradually change going into the future. 

  • 2 months ago

    It is a very odd coincidence, and it doesn't seem to be a necessary condition for life as we know it to appear or survive on this planet, although a large satellite is.

  • ?
    Lv 5
    2 months ago

    Look at it this way. The only coincidence is that we happened to live in the period when the moon is at its present distance from Earth. The moon, at its creation over 4 billion years ago, was only about 20/25,000 km away from our planet. It's been receding ever since at the present rate of about 4 cm each year (maybe more, maybe less as time passed).

    So as you can see, it is not a coincidence, it just so happens that during the current period of time, we humans see both celestial bodies under an angle of half a degree, also the reason we observe total sun eclipses. And this, by implication, will not hold true for the future.  

  • Sky
    Lv 7
    2 months ago

    It's all a matter of trigonometry.  The average apparent size of the moon (which varies as its orbit takes it closer and farther from the Earth) combined with its distance of almost a quarter million miles results in a viewing angle just about identical to that made by the size of the sun combined with its average distance from Earth.  That viewing angle results in the two objects having the same apparent size even though their physical sizes are vastly different. 

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