It was absolute in its deisgn and movement-purpose. My daughter and I will never forget that evening!

On our first night at an all-inclusive resort in the Mayan Riviera, about 30 min south of Cancun, I was walking back from dinner with my wife and 17 year old daughter about 150 yards from the beach, and looked up to notice the incredibly clear night sky and brilliant stars.  
I immediately noticed, looking up toward direct south at about 45 degrees, a group, like stars, of three to four small white lights (about 3-4 inches across at end of arm's length) tilted like a flattened arrowhead, silently moving-streaking in a straight line at a very high rate of speed from east-northeast (about 2:30) to west-southwest (about 8:30).  
I jumped and pointed stating "did you see that!" to my wife, and my daughter responded immediately "yes, I saw that".  Her description is that she only saw a strange "grouping of light".  
I think like most I have tried to find some explanation but it was the "speed" and clarity in geometric design which! I cannot rationalize.  I saw it with my arm strecthed up at approx. 45 deg SE until it disappeared in the SW in less than one second.  I only noticed the lights, no structured material or color, and sensed its altitude low, maybe 1000ft., but who knows?
Witness indicates that the date is approximate.  PD