Two bright stationary objects that suddenly appeared and slowly faded while staying in the same position. Duration 10 seconds.Was leaning on the railway bridge on the cliff walk over Naylor's Cove looking up at the moon (looking southwards and was there maybe 3 or 4 mins) when suddenly 2 bright but stationary lights suddenly appeared out of nowhere in the sky between the moon and the skyline of Bray Head and to the right of Orion's lower stars...As I watched the lights they remained the same intensity but after 3 or 4 seconds became smaller as they slowly faded to black in unison while staying in the same position... it was 17:59 The lights were brighter than Venus and about the same size as we see it in the mornings... it was the darkest place on the path and have never seen anything like it! The whole thing took about 10 seconds.....Not an aircraft but there were 2 in the vicinity, one arriving from south and entering the queue for landing at Dublin (10 mins away), the other high up almost directly over the moon moving northwards with jet trail showing under the moonlight. I had spotted this twin engined jet (B767?) a couple of minutes before the lights appeared....Gave the impression they were attached to the same body, in other words 1 craft, were switched on simultaneously and faded in unison at the same rate while remaining in the same position... Did not appear as if they suddenly sped away, rather that the lights were extinguished.There was no sound.((NUFORC Note: Witness elects to remain anonymous; provides little contact information. PD))