Tellurian - 1. Of or characteristic of the earth or its inhabitants 2. An inhabitant of the earth.
Minerva McGonagall had always been down-to-earth. Unlike many of her students, or even her fellow Staff Members, she had never been given to flights of fancy. She didn't see the point in imagining what might be or what might have been.
Some people thought that strange for a Transfiguration teacher, who spent her days teaching children to alter the world around them, but she had her reasons. You couldn't change the past, so why dwell on it?
Oh yes, Minerva McGonagall was very much a woman of the moment; a woman of this earth. She was very much a tellurian.