They ask you about the phases of the moon…

 

They ask you about the phases of the moon.  Say, "These are signs for the people to reckon dates and fix the periods of Hajj."EN2-198. 2-189

 

EN2-198 - The phases of the moon have always attracted the attention of moon in every age, and different kinds of rites and superstitions have been connected with these in every country.  The Arabs also had some superstitions connected with these.  They took omens from them for journeys, marriage, business, etc., and performed some superstitious practices, for they believed that the phases and eclipse of the moon affected their fortunes.  Therefore, they questioned the Holy Prophet concerning the same thing.  Allah answered their question and informed them that the phases of the moon were nothing more than a natural calendar.  Hajj has been specially mentioned in this connection because of its religious, cultural and economic importance to the Arabs.  Four months of the year were fixed for Hajj and Umrah and war was suspended and the routes were made safe, and business flourished on account of peace.