the lights had a rotational sequence on the bottom

Port Noarlunga is just south of Adelaide,on the coastline. It was a calm night with only occasional clouds. I was outside waiting for someone, when an object came over the house. there was no distinct noise, considering how low it was.
The object was round in shade, and had a row of lights around the base, the lights either rotated, or had a sequence of rotation. The object was travelling very slow, in an easterly direction out to sea. The house was situated 1 block away from the cliffs, which dropped to the ocean, so i was able to watch it travel for quite a distance out to sea.
It sped up a little, out to sea, then for reason changed it's course to a southerly, direction, and took off out of sight in a near verticle climb.
This has stayed with me for many years, and i can still remember the shape and coulur of the object. My two brothers had been outside with me, but i have never asked them if they had seen it also. Probably for fear of being laughed at.
Date is approximate.  We have assigned an artificial date in June 1976 so that the report sorts to that month.  PD