Light that moved unlike a terrestrial aircraft.At approx. 6:45pm PST on 03-06-15, I was on the front porch having a smoke with my mother. I looked to the WSW and saw the planet Venus. Then I looked to the north and saw a stationary white light at approx. 25° azimuth. I continued to watch the light, and noted that it was briefly eclipsed by a power line across the street. At this point, I knew it wasn't a star or a planet because it was moving in the wrong direction.As I continued to watch the light, it flew slowly SW. I figured that it was just a high-altitude aircraft. I looked over at Venus again, looked at it for ~5 seconds, then turned my head north again -- and much to my astonishment, the light had moved much, much more quickly (est. 85° azimuth now) than my 5-second glance at Venus would have allowed had the light been a terrestrial aircraft.So I pointed it out to my mother, and she had observed the light making a zig-zag motion across a fair percentage of the sky visible to us.Both of us continued to watch the light as it flew overhead and disappeared behind the limb of our roof.The light was white (not yellowish or bluish) and had no colored strobes that would be indicative of a terrestrial aircraft, and exhibited no engine noise whatsoever.I strongly believe that this object was not from our neighbourhood if you will.