Gayathri Mantra - What is the difference

[zaxonate47 0]

Hi all,

 

I have known that the following is Gayathri Manthram

"Om bhur bhuva suvah, tat sah vithur varenyam bhargo devasya dimahi, dhiyoyonah prachodayaad"

 

I recently came across another one as follows:

"OM AGNERVAKPUNSI YAJURDEDIN JUSHTA SOMAM PIBA SWAHA" (as indicated in http://www.indiadivine.org/audarya/hinduism-forum/412388-ideal-brahmin-significance-gayatri-mantra.html)

Can you please illuminate me on what is the difference ? What is the significance of each?

Thanks a lot!

Siva.