Large spherical fireball moving faster than Boeing towards sea.Saw very large spherical fireball, more orange than red, with very prominent dark outline (darker than night sky), descending from the sky in a diagonal line to the southwest. Much faster than a Boeing. Lost sight of it as it descended past the roof of neighbour's house. Looked like it was moving towards the sea. Our house is approximately 1.2 kilometres from coastline. No sound emanated from sphere and it looked like the phenomenon moved with purpose on a set course, not like random phenomena of nature. Constant speed, not accelerating. Definitely not a weather balloon and not a meteorite, much too large to be the latter. Wondering whether the excessive speed of the phenomenon perhaps causes friction with the air molecules, hence the fireball appearance? Definitely an unidentified flying object.