Theodore Jacobsen Observatory

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Inside the dome
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Inside the dome

The Theodore Jacobsen Observatory is the on-campus observatory of the University of Washington. Built in 1895, it is the second oldest building on campus and was constructed of the remaining Tenino sandstone blocks from Denny Hall, the oldest and first building on campus. The refracting telescope enclosed within the dome has a 6-inch Brashear objective lens on a Warner & Swasey equatorial mount. The observatory also includes a transit room on the westside and a 55 seat classroom, which was built later, on the southside.

The Theodore Jacobsen Observatory (2006)
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The Theodore Jacobsen Observatory (2006)

Today the observatory is primarily used for public outreach and is run jointly by the UW Department of Astronomy and the Seattle Astronomical Society. Every first and third Wednesday between March and November the observatory is open to the public.

The observatory is listed on the State Register of Historical Buildings.

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