Strange light in the sky...

xxx wrote:

I've been able to see it almost every night since the beginning of summer
always in the same position in the sky. It might have just been me but I've
seen it "pulse" in brightness of light and lower in the sky as if it was
setting like the sun/moon.

If it has been in the same position every evening for months it can't
be a celestial object. You say it only acts "as if it was setting" --
if it doesn't actually set, or appear higher in the sky the earlier
you observe it, that pretty much clinches it being terrestrial.

Could it be that you're seeing the landing lights of jets approaching
Pearson, in alignment with your location? They come in almost
continuously, only about a minute apart (during peak hours at least),
and the pulsating or oscillating effect you see might actually be
from one aircraft replacing another in the 'train'. If you're in
Etobicoke or northeastern Mississauga you might be in line with
Runway 33 (330° is between NW and NNW); the wind probably comes off
Lake Ontario most evenings, so it would seem plausible that the 150°
landing approach, toward the lake, be used.

--
Odysseus