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Thread: How many days in a year are ?

  1. #1 How many days in a year are ? 
    Forum Freshman
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    Oct 2013
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    Look , i have got the following data from
    wikipedia

    1 light year ( distance travelled by light
    in 1 year) = 9,460,730,472,580,800 metres
    (exactly)
    Speed of light = 299792458 metre/second (
    exactly )
    So time taken by light to travel a distance
    of 1 light year will be
    Time = Distance travelled / Time taken
    = 9,460,730,472,580,800 /
    299792458 Seconds
    = 31557600 seconds
    Now ,
    1 Day = 24*60*60 seconds =
    86400 seconds
    so, 1 second = 1/86400 seconds
    So , converting time taken by for
    travelling in 1 light year into days will
    give number of days in 1 year wich comes out
    to be 31557600 / 86400 = 365.25
    So according to this , a year should e
    equal to 365.25 days
    All I wanted to know is my presumption
    right ? Because if you Google the above
    question or convert 1 year into days with
    Google, it will give the value of 365.242
    days . So am i correct or Google is ?

    PS - I asked the same question on yahoo answers and got some really ridiculous answers so I decided to aks in the science forum . So please provide some scientific explanation for your answers. Thanx


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  3. #2  
    Genius Duck Dywyddyr's Avatar
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    I'm not entirely sure what your question is but it appears that you're confused about "year" as used in a light year and "year" as used on a calendar.
    Perhaps if you'd carefully looked at the relevant Wikipedia entries:
    Light year: As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year
    So look at Julian year: In astronomy, a Julian year (symbol: a) is a unit of measurement of time defined as exactly 365.25 days of 86,400 SI seconds each.

    In other words the "year" used for light years is a standardised measure that is defined ("arbitrarily") - NOT the "year" that's given by one orbit of Earth around the Sun (that being, of course, 365.242 days).


    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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  4. #3  
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    Quote Originally Posted by saurabhkumarsingh View Post
    Look , i have got the following data from
    wikipedia

    1 light year ( distance travelled by light
    in 1 year) = 9,460,730,472,580,800 metres
    (exactly)
    Speed of light = 299792458 metre/second (
    exactly )
    So time taken by light to travel a distance
    of 1 light year will be
    Time = Distance travelled / Time taken
    = 9,460,730,472,580,800 /
    299792458 Seconds
    = 31557600 seconds
    Now ,
    1 Day = 24*60*60 seconds =
    86400 seconds
    so, 1 second = 1/86400 seconds
    So , converting time taken by for
    travelling in 1 light year into days will
    give number of days in 1 year wich comes out
    to be 31557600 / 86400 = 365.25
    So according to this , a year should e
    equal to 365.25 days
    All I wanted to know is my presumption
    right ? Because if you Google the above
    question or convert 1 year into days with
    Google, it will give the value of 365.242
    days . So am i correct or Google is ?

    PS - I asked the same question on yahoo answers and got some really ridiculous answers so I decided to aks in the science forum . So please provide some scientific explanation for your answers. Thanx
    I don't know how to say it in English but the numbers get shortened... most of time especialy on internet...
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  5. #4  
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    Thanks buddy , I have just got the same result after searching it thoroughly on Wikipedia. So I got my question resolved myself. Thanks for the reply anyway.
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