<sect2 id="calc-sidereal"> <title >Módulo da hora sidérea</title> <indexterm ><primary >Ferramentas</primary> <secondary >Astrocalculadora</secondary> <tertiary >Módulo da hora sidérea</tertiary> </indexterm> <screenshot> <screeninfo >O módulo de calculadora da hora sidérea </screeninfo> <mediaobject> <imageobject> <imagedata fileref="calc-sidereal.png" format="PNG"/> </imageobject> <textobject> <phrase >Hora sidérea</phrase> </textobject> </mediaobject> </screenshot> <para >This module converts between <link linkend="ai-utime" >Universal Time</link > and Local <link linkend="ai-sidereal" >Sidereal Time</link >. First, select whether you will use Universal Time or Sidereal Time as an input value in the <guilabel >Input Selection</guilabel > section. You must also specify a geographic longitude, and a date for the calculation, in addition to either the Universal Time or the Sidereal Time value. When you press the <guibutton >Compute</guibutton > button, the corresponding value for the other Time will be displayed. </para> </sect2>