Posted on 05/25/2015 4:24:26 PM PDT by rickmichaels
Just saw these cool pics of opposite views of the same thing...sort of:
Was it worth it?
Yes indeed.
I have a general astronomy question.
If earth is something like 6 times, in volume, the moon has, then why does it seem that the earth, when looking at it from the moon, seem to look about the same size as the moon does from the Earth?
Omg no kidding great question
Refraction through the crystalline spheres.
And here I thought that the earth is closer to the moon than the moon is to the earth. Stupid public education...
First, volume is not relevant. Radius is. What you’re looking for is the angle subtended by the radius of Earth from moon and moon from Earth.
Earth radius is about 6400 kilometers. X 2 is a diameter of 12,800 kilometers. Distance to moon varies by 43600 Km. Nearest point is 363,000 kilometers.
12800 km / 363000 km = .035 arctan of that is 2 degree subtend
Longest distance is 407000 km so 12800/407000 artan = 1.8 degrees
That would be how the earth looks from the moon.
The moon from earth is
diameter 3400 kilometers/407,000 kilometers and arctan 0.50 degrees
diameter 3400 kilometers/363000 km and arctan is .54 degrees
So the diff is 1.5 degrees, in pure math and this is an amount easily smudged outward by atmospherics for the Earth observer.
Wait just a darned minute!! I saw “John Carter” and it didn’t look that way in the movie.
Depends on the focal length of the lens taking the picture.The shorter the focal length, the smaller the moon is going to look in the frame.
What about the Ewell Gibbons?
CC
We are not worthy.....
My wife shot her first deer at dusk. There was a huge rising full moon so I laid down and got it over her shoulder for a nice picture. Came out looking like a BB.
LOL! Really!
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