# How many days there would be in an year?

@oarnamav (2708)
India
February 11, 2007 12:26pm CST
If our earth would have been close to the sun by half the distance as to the present. How many days would have been in an year? You reply or wait for the answer.
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1 response
@urbandekay (18314)
11 Feb 07
The velocity required to maintain an orbit around the sun is given by the following formula. v = 107225 root of (2/r)- (1/a) since you ask what is the time of rotation around the sun at half the distance, r is halved then the velocity will need to be approximately 3 times that of the earth. The circumference of orbit is pi d so circumference is halved. Thus orbit time or length of a year would be approximately 365.25/6 = 60.875 days However, we would need to consider whether the rotational velocity of the Earth about its axis would be affected since this would alter day length, thus further changing the number of days in a year. Also this ignores the mass of the Earth since it is insignificant to that of the Sun, which would slightly alter the result. all the best urban
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