I was watching stars from my terrace (8th floor) which i usually do as exercise for eyes. i get a full view of sky from north to southwest from here. at around 10.15pm four faint(but clearly visible) greenish white starlike lights (orbs) appeared at north flying in west to east direction at very high speed. their shape was vertices of isosceles triangle with fourth light as midpoint of other two(like an arrowhead). they were visible for only 1 sec before vanishing or fading as they flew towards east(30 degree above horizon). their trajectory was curving just before disappearing as they suddenly started pointing towards northeast. i was shocked and tried to calm down as i thought it may have been an airplane or a helicopter. but commercial airplane airplanes fly only north-south direction here and there was no sound. and moreover no airplane or heli can fly so fast. but i still thought it must have been my imagination. i decided to continue observing and after 15-20 mins they appeared again, this time they flew from west to east in a straight path with a little lower speed than before. this time i was convinced and decided to report to mufon. i wasn't able to capture any photo regretfully as my phone camera not so good.