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Author Topic: A question - Earth's orbital period and distance  (Read 6115 times)

Offline hamza

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A question - Earth's orbital period and distance
« on: 30/05/2007 17:21:35 »
hi people.. i m new to this web site.. i found it quite interesting and informative.My question is that if the earth revolves arround the sun in an orbit with a radius half of the radius with which the earth is orbitting now... Than how many days will be their in one year 
« Last Edit: 31/05/2007 11:14:43 by another_someone »


 

Offline lightarrow

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Re: A question - Earth's orbital period and distance
« Reply #1 on: 30/05/2007 21:20:08 »
hi people.. i m new to this web site.. i found it quite interesting and informative.My question is that if the earth revolves arround the sun in an orbit with a radius half of the radius with which the earth is orbitting now... Than how many days will be their in one year 
If I computed correctly, 129 days (365/√8).

P.S.
Welcome on this Forum hamza!
« Last Edit: 30/05/2007 21:23:00 by lightarrow »
 

Offline Karen W.

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Re: A question - Earth's orbital period and distance
« Reply #2 on: 30/05/2007 22:00:47 »
Welcome Hamza And Good day to you Alberto!
 

Offline Seany

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Re: A question - Earth's orbital period and distance
« Reply #3 on: 31/05/2007 00:21:37 »
Welcome Hamza!! Great question ;D
 

Offline syhprum

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Re: A question - Earth's orbital period and distance
« Reply #4 on: 31/05/2007 09:35:58 »
Please let me know how the factor 8^0.5 is derived in your equation, if I try to apply this to the orbital time of an Earth orbiting satellite compared to one in geostationary orbit I cannot make it work.

Failed O level maths 1944.
 

Offline hamza

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A question - Earth's orbital period and distance
« Reply #5 on: 31/05/2007 15:16:37 »
hey guys.. i found the answer.. infact light arrow is right.. the formula used is T(square) α R(cube).. where T is the number of days and R is the radius.. so we can take T(1) to be 365 days and T(2) is to be calculated. R(1) is the present radius of the orbit and R(2) is half of R(1) . Now divide both equations and u get 365/√8 ... 129 days.
 

Offline syhprum

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A question - Earth's orbital period and distance
« Reply #6 on: 31/05/2007 19:14:28 »
This does not compute for me!, if I take the orbit of a geosynchronous satellite (35,768km) and divide it by the height of a ground level satellite (6441 km)I get the ratio 5.553.
Cube this and the take the sqr gives me 13.086 but the ratio of orbital times is 1436/84 = 17.1 !! Where am I going wrong ?
 

Offline syhprum

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A question - Earth's orbital period and distance
« Reply #7 on: 31/05/2007 19:31:33 »
The penny has dropped. the distance of the geosynchronous satellite from the centre of the Earth should have been used not the height, when I use this the result comes out correct.
This calculation uses Keplers 3/2 power law
« Last Edit: 01/06/2007 06:56:15 by syhprum »
 

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A question - Earth's orbital period and distance
« Reply #7 on: 31/05/2007 19:31:33 »

 

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