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“Bite-Size Bits of Local, National, and Global History”
Fort Ancient in Warren County, Ohio — The American Midwest (Great Lakes)
 

Astronomical Alignments

 
 
Astronomical Alignments Marker image. Click for full size.
By William Fischer, Jr., December 6, 2009
1. Astronomical Alignments Marker
Inscription.
American Indians who built Fort Ancient used the sun and moon to measure time. By observing the rising location of these celestial objects they knew when to gather together for religious or social events or when to plant crops. They used sunrise locations to predict annual events and moonrise location to measure intervals of several years' duration.

You are at the southwest corner of a nearly perfect square made by four mounds. Three astronomical alignments have been demonstrated from this point.

On the summer solstice, usually June 21, the sun rises in the gap just north of Rt. 350. 2

The maximum northern moonrise 1 occurs approximately 9.3 years after the minimum northern moonrise 3 with this complete lunar cycle taking 18.6 years or one generation.
 
Erected by The Ohio Historical Society.
 
Location. 39° 24.437′ N, 84° 5.416′ W. Marker is in Fort Ancient, Ohio, in Warren County. Touch for map. Marker is about 300 feet NW of the museum and about 500 feet SW of the on Fort Ancient State Memorial entrance. Marker is at or near this postal address: 6123 Ohio Route 350, Oregonia OH 45054, United States of America.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker
Astronomical Alignments Mound and Marker image. Click for full size.
By William Fischer, Jr., December 6, 2009
2. Astronomical Alignments Mound and Marker
Looking toward Ohio Route 350 (near treeline).
. Middle Fort Ditch Construction (approx. 0.2 miles away); Twin Mounds & Parallel Walls (approx. mile away); Stages of Construction / Crescent Mounds (approx. 0.4 miles away); Changes at Fort Ancient (approx. half a mile away); The Civilian Conservation Corps (approx. 0.6 miles away); Fort Ancient Earthworks (approx. 0.6 miles away); Hilltop Enclosure (approx. 0.6 miles away); North Overlook (approx. 0.6 miles away). Touch for a list and map of all markers in Fort Ancient.
 
Also see . . .
1. Fort Ancient. (Submitted on February 26, 2010, by William Fischer, Jr. of Scranton, Pennsylvania.)
2. Fort Ancient Earthworks. (Submitted on February 26, 2010, by William Fischer, Jr. of Scranton, Pennsylvania.)
 
Categories. EnvironmentMan-Made FeaturesNative AmericansNotable EventsScience & Medicine
 
Astronomical Alignments Diagram image. Click for full size.
By William Fischer, Jr., December 6, 2009
3. Astronomical Alignments Diagram
 
 
Credits. This page was last revised on June 16, 2016. This page originally submitted on February 26, 2010, by William Fischer, Jr. of Scranton, Pennsylvania. This page has been viewed 752 times since then and 31 times this year. Photos:   1, 2, 3. submitted on February 26, 2010, by William Fischer, Jr. of Scranton, Pennsylvania.
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