I went to play tennis late, and got to the Tennis Federation until
12:13 pm. Was practicing my strokes for a good while when I decided to practice serve. This was around 12:50. I started serving several balls and in one I missed the toss so I tossed the ball again but I saw something peculiar on the sky.
I saw something white or silver floating on the sky that almost didn't move. I thought it was a plastic bag that had flown very high in the sky but then I realized it wasn't because of its movement.
The object was very high, at the height the highest crow you can see flying in the sky. I stood there awestruck watching the object's movements.
At one point I could see the object moving intelligently, as if someone was piloting it and not the movement of an inflated plastic bag that I had thought.
I was only able to appreciate this object because I was wearing eye protection,
polarized sports glasses to be exact. The glare at this time of the day is exaggerated and even with my glasses on my eyes started getting very tired after 1 minute of looking up. The object continued its movement across the sky and finally it went upwards to a point were it was impossible for my naked eye to appreciate its path.

Fui a jugar tenis tarde, y llegue a la Federacion Nacional de Tenis hasta las 12:13 pm. Estaba practicando mis tiros por un buen tiempo cuando decidi practicar mi servicio. Esto fue tipo 12:50. Hice varios lanzamientos hasta que tire mal una bola pero al volver a lanzarla, me di cuenta que habia algo pecualiar en el cielo. Era algo plateado o blanco flotando en el cielo y al principio casi no se movia. Pense que era una bolsa plastica que se habia ido flotando hasta el cielo pero bajo una inspeccion mas cuidadosa vi que no poida ser una bolsa. El objeto volaba de una manera que parecia que alguien lo estaba piloteando y no parecia ser llevado por el viento. Pude apreciarlo porque llevaba proteccion, unos lentes oscuros polarizados para ser exacto. El brillo a esa hora era exagerado y rapidamente mis ojos se cansaron de verlo despues de 1 minuto de ver hacia arriba aunque segui viendo el objeto hasta que desaparecio a pesar de que mis ojos ya se habian saturado de tanta luz.