Saturday, September 19, 2009

Does Earth revolves aroud Sun ??

Warning: I am no astronomer or a researcher. Everything below are my random thoughts :P

Does Earth revolves around Sun? Or is it the other way round? Yeah... I know Galileo told this four centuries ago that its Earth that revolves around Sun, but this doesn't means that I can't raise a doubt.. :D :P.

It was around two months back when I was working in my office and this popped into my head. I pinged my colleagues to know their opinion and it was declared that I was getting mad [eh eh eh]. Anyway, back to the point: does Earth really revolves around Sun? Me and everyone else has been taught this in school. But I remember reading another thing, that if two bodies are in motion then both of them are revolving around each other. So, when you say which one is revolving around the other one, it totally depends on the frame of reference. With respect to Earth's frame of reference isn't it absolutely correct that Sun, Moon and all other celestial bodies are revolving around Earth?

Just a thought, may be Sun and Earth are revolving around the combined center of mass (you can extend this for all planets). The center of mass would be closer to Sun so, its revolving in a small circle and the Earth is revolving in a bigger circle. So, when you look from the reference frame of one you can see the other revolving in an elliptical orbit!

Yeah, this all may not make any sense, but it just came back to my mind.. so I thought to put it down..


  1. it really very good.
    I love it !
    I like it !
    thanks :)- .


  2. Have myself thought about it long back and my thoughts were almost on similar lines... reactions of people .. almost same :D

  3. jo likha hai wo to theek hai, but kyo?
    Newton ke laws revise kiye kya recently? Frame of reference and relative motion fundaas ...

  4. nahi .. fracture ke bad kafi khali time tha ... :D

  5. Dude, you are totally correct, what you described is very very correct. If there were two equal mass objects, they would revolve around the centre of mass. The sun does this as well, this method is used to detect exoplanets. But, thinking about how do we know if it is us revolving around the sun or sun around us, I guess it would come from the fact that there are other planets revolving the sun as well, and since they are not revolving around us, it must be pretty certain that we revolve around the sun as well. Keep up the critical thinking, don't doubt yourself if you are logically correct, never let conformism guide you.

  6. @JP
    What is revolving around what .. it just depends on your frame of reference. Place your origin at Earth's center, with Y axis towards NP, X axis towards prime meridian and plot the path of any planet/star. You'll get the path of objects as revolving around Earth (in elliptical orbits).