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Fringe Reception General
Astra 1H is @ 21.73 west moving west to ?
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<blockquote data-quote="Lazarus" data-source="post: 973853" data-attributes="member: 323322"><p>Yes indeed.</p><p></p><p>The very first thing I learned during my First Year University Module on Instrumentation was how to distinguish between Precision and Accuracy.</p><p></p><p>At its most basic, Precision might relate, as in this case, to the available number of decimal places the readout allows. But greater Precision is of no value if the method of quantifying the property being evaluated is not Accurate.</p><p></p><p>Say, for example, your car speedo says you are travelling at 57.869 kph ....... well, as the way speed is measured is notoriously inaccurate, albeit designed always to over-report, you might actually only be doing 52 kph. Consequently, the "precise" readout is misleading.</p><p></p><p>Methods of speed enforcement used by the Police will be highly accurate (In theory) but it might still not be necessary to apply more precision than, say, one decimal place.</p><p></p><p>Does that make sense?</p><p></p><p>So, in the case above, it's all well and good giving the Satellite position to 3 decimal places, but it's well know the figure is likely to be wrong, depending upon how it was measured, when it was measured, whether any extrapolation is involved .... etc.</p></blockquote><p></p>
[QUOTE="Lazarus, post: 973853, member: 323322"] Yes indeed. The very first thing I learned during my First Year University Module on Instrumentation was how to distinguish between Precision and Accuracy. At its most basic, Precision might relate, as in this case, to the available number of decimal places the readout allows. But greater Precision is of no value if the method of quantifying the property being evaluated is not Accurate. Say, for example, your car speedo says you are travelling at 57.869 kph ....... well, as the way speed is measured is notoriously inaccurate, albeit designed always to over-report, you might actually only be doing 52 kph. Consequently, the "precise" readout is misleading. Methods of speed enforcement used by the Police will be highly accurate (In theory) but it might still not be necessary to apply more precision than, say, one decimal place. Does that make sense? So, in the case above, it's all well and good giving the Satellite position to 3 decimal places, but it's well know the figure is likely to be wrong, depending upon how it was measured, when it was measured, whether any extrapolation is involved .... etc. [/QUOTE]
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Fringe Reception General
Astra 1H is @ 21.73 west moving west to ?
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