Time zone varies from Place to place and the people working in BPO would be aware of this fact as people work in different time zones depending upon the nationality of the client for whom they work.. Howsoever much one of the earliest people to have utilised the concept of time zone in their calculations could possibly be the astrologers.
Important information required to cast an horoscope are
Date of birth
Time of birth
Place of birth..
Place of birth is significant aspect as this information takes care of the aspect of time zone
