<sect2 id="calc-julian"> <title >Módulo do día xuliano</title> <indexterm ><primary >Ferramentas</primary> <secondary >Astrocalculadora</secondary> <tertiary >Módulo do día xuliano</tertiary> </indexterm> <screenshot> <screeninfo >O módulo da calculadora do día xuliano </screeninfo> <mediaobject> <imageobject> <imagedata fileref="calc-julian.png" format="PNG"/> </imageobject> <textobject> <phrase >Día xuliano</phrase> </textobject> </mediaobject> </screenshot> <para >This module converts between the calendar date, the <link linkend="ai-julianday" >Julian Day</link >, and the <firstterm >Modified Julian Day</firstterm >. The Modified Julian Day is simply equal to the Julian Day - 2,400,000.5. </para ><para >To use the module, select which of the three dates will be the input, and then fill in its value. Then press the <guibutton >Compute</guibutton > button, and the corresponding values for the other two date systems will be displayed. </para> <tip> <para >Exercicio:</para> <para >A que data do calendario corresponde o día xuliano modificado = 0,0? </para> </tip> </sect2>