Rooftop Variables is a hands-on training program for middle- and high-school science teachers in the New York City area, based out of Columbia University's Department of Astronomy.

Even from New York City, it is possible to make scientifically useful observations of variable stars!

We observe from the roof of Pupin Hall, on 120th Street between Broadway and Amsterdam Avenue, from what we have named the West Harlem Observatory (WHO), which is adjacent to the historic Rutherford Observatory.