Pick a coordinate system and stick to it. Since we are on earth most of the time, we pick earth's orbit as the zero-zero. If we were on Mars we would pick Mars' orbit as zero-zero. Or, we could pick the plane of the sun's equator, which until recently was not known as precisely as earth's orbit. Pick one.
Did your respond to the wrong post, or do you need to take time to actually read? When did I say anything about which plane to identify as 0-0?