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    Default Standards



    I was wondering if any standard have been derived or produced by the observation in space.

    One example i may be wrong is that we know the distance of how far the sun is and the time taken for the light to reach the earth 8 minutes, we are able to find out the speed of light.

    I am doing an assignment and I have put this as my introduction. I just want to back up my claim by an example.

    There are 4 different types of standards Natural Standard, Physical Standard, Attribute Standard and Variable standard. A natural standard is our understanding of the world we live in so that we observe and by our observations and analysis we are able to derive a physical standard. In early history mankind used to use his body parts, and his natural surroundings as measuring instruments to make a measurement. Nowadays we are making standards derived from the smallest particles and waves in the light spectrum. Also by our observations in the vastness of space we are able to derive new standards.

    Thank you ever so much

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    I suspect your example may possibly be backwards - it's a lot easier to work out the time, knowing the distance and the speed. I can't think of any way you'd be able to meaure the time independantly - if you see something happen on the sun how do you know how long ago it occurred?

    You might want to look at how the parsec was defined, and how the positions of jupiters moons are predicted (since that needs to factor in how long it takes for the light to reach us).

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    Quote Originally Posted by jerryTheC View Post
    You might want to look at how the parsec was defined, and how the positions of jupiters moons are predicted (since that needs to factor in how long it takes for the light to reach us).
    ...and, relating back to your original example, check out how observations of the moons of Jupiter can be used to measure the speed of light.

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    Do not go too far for seeing how Astronomy intersects with standards. Look at your watch, or calendar. 23h 56m 4.100s - rotation period of Earth around it's axis, not coincidentally 24h is worldwide standard of day length. And 28/29/30/31 day month? Mutual "child" of the Moon's 29 d 12 h 44 min 2.9 s synodic period and Earth's rotation time around the Sun divided by 12.

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    Default Standards

    Thx so much for your replies.

    It was silly of me with the example of the sun haha how can we measure the speed if we don't initially know how long the light takes to reach the earth. It's not like we can switch the sun off.

    See my assignment is on The requirement in aviation industries to apply rigorous standards to maintenance activities and how they evolved from using are feet as a rule of measurment.

    By our observations in space did we some how improve on the meter or something like that. When we look at an atom we were able to obtain the amperes, volts , coulombs. Also atomic mass has it not got somthing to do with obtaining a precise reading of mass (KG) I'm sorry if I sound ridiculous.

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    I spent 6 years working for a lab that had spun off from our NBS. From that perspective I don't see astrophysics as contributing to our knowlege of "standards" so much as realizing that we must sometimes be arbitrary.

    The meter, for example, has changed over the past 13 billion years and continues to change. So we must find a meaningful way to establish a meter today that everyone can use.

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