Conversation so far:
Where did Matthew Fontaine Maury grow up?
He was born in 1806 in Spotsylvania County, Virginia, near Fredericksburg.
Did Matthew Fontaine Maury's family stay in Spotsylvania County, Virginia?
The family moved to Franklin, Tennessee, when he was five.

Question: How or when did he become interested in astronomy or the ocean?
Self-contained rewrite: How or when did Matthew Fontaine Maury become interested in astronomy or the ocean?