question: What African American astronomer and almanac author was born in Baltimore County, Maryland?
answer: Benjamin Banneker
context: Title: Maryland Route 147
  Passage: Maryland Route 147 (MD 147) is a state highway in the U.S. state of Maryland.  Known as Harford Road, the state highway runs 18.81 mi from U.S. Route 1 (US 1) in Baltimore north to US 1 and US 1 Business in Benson.  MD 147 is an alternate route to US 1 between Baltimore and Bel Air, the county seat of Harford County.  The state highway is the main street of several neighborhoods in Northeast Baltimore and the Baltimore County suburbs of Parkville and Carney.  MD 147 is maintained by the Maryland State Highway Administration in Baltimore and Harford counties and by the Baltimore City Department of Transportation within the city.  Harford Road was a pair of turnpikes before the Baltimore–Carney portion of the highway was designated one of the original state roads.  The Baltimore County section of MD 147 was constructed in the early 1910s and widened multiple times in the late 1920s and 1930s.  The section of the state highway in Harford County was built in the late 1920s.
  Title: Benjamin Banneker
  Passage: Benjamin Banneker (November 9, 1731October 9, 1806) was a free African American almanac author, surveyor, naturalist, and farmer.  Born in Baltimore County, Maryland, to a free African American woman and a former slave, Banneker had little formal education and was largely self-taught.  He is known for being part of a group led by Major Andrew Ellicott that surveyed the borders of the original District of Columbia, the federal capital district of the United States.
  Title: Banneker Circle
  Passage: Banneker Circle is a partial traffic circle in Southwest Washington, D.C..  The name of the circle commemorates Benjamin Banneker, an African American astronomer and almanac author.  In 1791, Banneker assisted in the initial survey of the boundaries of the District of Columbia.  The circle is near the south end of L'Enfant Promenade and the intersection of Interstate 395 and Maine Avenue.  Benjamin Banneker Park is within the Circle.
  Title: Glyndon, Maryland
  Passage: Glyndon, Maryland is an unincorporated community in Baltimore County, Maryland, United States.  Founded in 1871 by Dr. Charles A. Leas, the village is located in the northwest section of Baltimore County and is primarily a residential suburb of metropolitan Baltimore City.  The village is characterized by the predominance of historic Victorian homes and a strong sense of community among its residents.  Glyndon is listed on the National Register of Historic Places (1973) and on the Maryland Inventory of Historic Properties (1973); the Glyndon Historic District was also designated as the first historic district in Baltimore County (1981).  Also listed on the National Register of Historic Places is the Worthington Valley Historic District.
citations: Banneker Circle Benjamin Banneker