The Index is open to the public all year. During the academic months, hours are from 9:00 a.m. to 5:00 p.m. from Monday to Friday. From mid-June to mid-September, hours are from 9:00 a.m. to 4:30 p.m. Monday to Friday. The Index is closed on weekends and major holidays and may close briefly during the week between Christmas and New Year’s Day. Visitors are welcome at all open hours. Online access to the Index database is available within the archive and from anywhere on campus when using Princeton’s network.