The observatory is on the roof of CAS, 725 Commonwealth Avenue, near the BU Central T stop. Enter from the West side, near Marsh Chapel, and take the elevator to the 5th floor. Just before CAS 520, there is a sign for the J.B. Coit Observatory. Take the stairs all the way up.
Note: There are two disjoint 5th floors in CAS. If you enter from the East side of CAS, you'll have to walk to the West half of CAS before you go to the 5th floor.
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