Halls Valley Astronomical Group

How to Find Us

The View to the Northwest over Halls Valley from the Halley Hill Observatory

The Halls Valley Astronomical Group is based at Joseph D. Grant County Park in the hills east of San Jose, California. Grant Park is located in a rural area and is separated from San Jose and the other communities of the Santa Clara Valley by a 2400 foot (700 meter) high ridge of the Diablo Mountains. Lick Observatory, on the summit of Mount Hamilton, home of the second largest refracting telescope in the world, is located 11 miles beyond the park entrance.

The HVAG's two observing sites for public programs, Telescope Row and the Halley Hill Observatory, are easily accessed from park roads.

Directions to Grant Park

In San Jose, from either highway 101 or highway 680, exit at the Alum Rock Avenue interchange. Go east on Alum Rock Avenue (which is also state highway 130) for 3.6 miles from route 101 or 2.2 miles from route 680. Turn right on Mount Hamilton Road (which continues state highway 130). There is a sign at this intersection indicating Grant Park. Continue on Mount Hamilton Road for 7.7 miles. This takes you over the first ridge of the mountains and into Halls Valley. Turn right at the park entrance, which is indicated by the large "Joseph D. Grant County Park" sign. If you are coming from outside of San Jose, our regional map of the Bay Area shows the location of Grant Park in relation to the major cities and highways.


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