Editing Sidereal time (section)

===Relationship between solar time and sidereal time intervals===
[[File:ConantClock.png|thumb|upright|This [[astronomical clock]] has dials showing both sidereal time and [[mean solar time]].]]
If a certain interval ''I'' is measured in both mean solar time (UT1) and sidereal time, the numerical value will be greater in sidereal time than in UT1, because sidereal days are shorter than UT1 days. The ratio is:
<math display="block">\frac{I_\mathrm{mean\,sidereal}}{I_\mathrm{UT1}}=r'=1.002\,737\,379\,093\,507\,95 + 5.9006\times10^{-11}t - 5.9\times10^{-15}t^2</math>

such that ''t'' represents the number of Julian centuries elapsed since noon 1 January 2000 [[Terrestrial Time]].{{Sfn|Urban|Seidelmann|2013|page=81}}