- Take I-475 from I-75 to the Secor Road exit.
- Go south on Secor (Left from westbound 475, right from eastbound).
- When you get to Bancroft St. turn left.
- At the second stop light you should see the observatory on the right, Cheltenham Rd. to the left.
- Go straight through this light and get all the way over to the right.
- The next light is the entrace to campus, turn right into campus. At the first parking lot (1N on the map) turn right into it. The north most building (the one with the smaller dome) is McMaster. Campus Map Mcmaster is labled MH on the map. RO is the Ritter Observatory.

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