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Gloria Dei Church National Historic SiteInterior of Gloria Dei Church
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Gloria Dei Church National Historic Site
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Site Address
Columbus Boulevard and Christian Street
Philadelphia, PA 19147

By Mail
143 S. Third Street, Philadelphia, PA 19106

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By Phone
Visitor Information
(215) 389-1513

By Fax
215-861-4950
The octant is a navigational tool based on the curve of one eighth of a circle. It measures angles for solar and celestial navigation.  

Did You Know?
In 1799, Salem native Nathaniel Bowditch revised John H. Moore's New Practical Navigator, the standard navigation manual of the 18th century. Bowditch discovered and corrected over 8,000 errors in Moore's manual! In 1802, Bowditch published the New American Practical Navigator.

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Last Updated: October 02, 2007 at 16:36 EST