Mrs Jill Williams, a 48-year-old nurse, of Sandy Road, described the object in the sky as "like a tangerine".
She said it was bright, and at first she thought it was a helicopter.
"I can't decide whether it was low or in space like another planet. I thought it was really weird," said Mrs Williams.
"I can't understand with something like this, that other people hadn't seen it."
Mrs Williams added: "It was a perfect, bright orange, no-nonsense flashing lights, but a perfect round circle, very bright."
Earlier this week Llanelli taxi driver Bob Hinton described seeing a "brilliant, absolutely brilliant orange light" coming from due north and heading south overhead near the railway station.
He said: "It was going about 6,000 miles an hour."
The strange sight was spotted at around 8.10pm on Saturday night.
One Post reader, who has asked not to be named, said the object was "highly likely to have been the international space station which was in view for a maximum of 20 seconds depending upon cloud cover, at 8.13pm on Saturday, travelling North North West to South.
"Whilst the space station does not emit light it reflects the suns glow, and is often viewed as an orange-coloured ball which moves across the sky at high speed (average 17,227 miles per hour) as it orbits the earth 15 times a day."
Related articles: