SIDEREAL CLOCK
\sa͡ɪdˈi͡əɹɪə͡l klˈɒk], \saɪdˈiəɹɪəl klˈɒk], \s_aɪ_d_ˈiə_ɹ_ɪ__əl k_l_ˈɒ_k]\
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[L.] Sidereal time is time reckoned by the diurnal motion of the stars, or more strictly by that of the (mean) first point of Aries, just as ordinary (mean) time is kept by the motion of the (mean) sun. A S. clock is regulated to show the sidereal time of any instant: e.g. it shows 3 hrs. when the first point of Aries is 45 or 3 hrs. west of the meridian. (For S. day, vide Day; for S. year, vide Year.)
By Henry Percy Smith
Word of the day
dust storm
- a windstorm that lifts up clouds of dust or sand a windstorm that lifts up clouds dust or sand; "it was the kind of duster not experienced in years"