From Points North or South:

Take I-95/Rte. 128 North or South (toward Waltham/Weston) to Exit 26, U.S. Rte. 20 West.

Follow Rte. 20 West into Weston.

Just after passing Crescent St. (on your right), bear right onto Boston Post Road. This takes you into Weston Center.

Pass through the center and turn right onto Concord Road.

Follow Concord Road through two forks. Bear left at the fork with Merriam Road, then bear right at the fork with Sudbury Road.

Just after the Sudbury Road fork, turn right into the entrance of the Observatory at 381 Concord Road.

From Points East:

Follow U.S. Rte. 20 West through Watertown and Waltham into Weston. Follow the directions for "From Points North or South."

From Points West:

Follow U.S. Rte. 20 East through Wayland into Weston.

Bear left onto Boston Post Road, just after Elliston Road.

Before arriving in Weston Center, take a left onto Concord Road and follow the directions for "From Points North or South."