Sitting on the hill in the park with my dog just looking at the clear sky which is a kind of deep blue color at 6:55 at night & i see a light coming from behind this apt. building.Initially i thought it was probably just another plane crossing the sky & it's direction is going upward to the right at a 45 degree angle but it doesn't have any blinking lights on it.So as i'm watching it ,i'm talking to myself on how the ufo-ish light i had last seen in this park a couple of months ago was moving way faster than this one.But this light wasn't even going fast ,i just like comparing my last sighting with anything i see flying in the air in hopes that it might be as fast .But anyway, right after i thought that the light just disappeared in the blue sky.At first i thought ,"oh that's weird. that plane just decided to turn it's lights off."but nothing was still going in the flight path of this light; it just straight up blinked off.And i was all puzzled & quickly looked around to see if any one else behind me may have seen it too.But it was just me & my dog.So then i got out my camera real quick & took a picture of the sky where it should have been but when i reviewed it & zoomed in there was no trace of it.Now that i think of it ,i bet it just switched into a different spectrum of light like infrared or something that we're not able to see.I really need to get a night vision camera.