Welcome! Today, NRIAG, will host the “Fifth Assembly of the Arab Conference on Astronomy and Geophysics” at the conference hall in the National Research Institute of Astronomy and Geophysics, Helwan, Cairo. Since (ACAG-1) in 2008, a conference is held every two years in October. In this year, from 17 to 20 October 2016, a 151 research will be discussed in the fields of Astronomy and Geophysics, and about one third of these researches are submitted by participants from Arab countries. The International participants are from Algeria, Saudi Arabia, United Arab Emirates, Malaysia, Russia, Iraq, India, USA and Jordan. So it will be a great opportunity to permit interaction between international Astronomers and Geophysicists. In addition, a number of agreements for joint scientific cooperation is scheduled to be signed on the sidelines of the conference between NRIAG and other Arabian research Institutes. For more details about the topics and workshops please visit ACAG-5 website, http://acag-conf.org/