Large black triangle, that made no noise and seemed transperant when looking up at it but solid and dark at a distance.

I was out star gazing with my telescope in January during a new moon waiting for the frost to clear off the lens.  Across the street behind the row of houses is a large building (a refractory) a parking lot is between the road and the houses and has lighting in the parking lot.  Not very much light gets behind the houses it is still very dark and perfect for using telescope.  Behind the houses it is farmland While I waited I saw what looked like a large dark bird over the building.  As it got closer a largeer it was a very dark triangle, like very dark glass , see through moving over the  street and the houses.  I estimated the width to be at least 200 feet as it covered five lots as it passed.  It made no noise had no flashing lights or any lights that I was.  But looking up at it it was darker than the sky and seemed to have stars in it as though I was looking through it at the night sky.  I watched it go out over the field behind me, it made no noise or disturbance at all.
Witness indicates that the date of the incident is approximate.  PD