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<strong>Time</strong> <strong>measurement</strong>:<strong>Solar</strong> <strong>Time</strong><br />
GoalUniform <strong>Solar</strong> <strong>Time</strong> unit definition<br />
Mean Sun Definition:<br />
•Circular Orbit (e=0)<br />
•Zero inclination of Earth orbit on the Equator (i=0°)<br />
Mean <strong>Solar</strong> Day= time interval between two consecutive passages of the Mean Sun<br />
on the local meridian<br />
(Proposed by Newcomb in 1895)<br />
Mean <strong>Solar</strong><br />
Day<br />
Local Mean <strong>Time</strong>(LMT): local hour angle of the mean Sun anti-meridian<br />
Universal <strong>Time</strong>(UT): Greenwich hour angle of the mean Sun anti-meridian