Great American Eclipse of 2017

Great American Eclipse of 2017 (HM293F)

Location: Perryville, MO 63775 Perry County
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Country: United States of America
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N 37° 43.512', W 89° 51.794'

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Inscription

Perry County Missouri

(panel 1 - Eclipse)
This sundial commemorates the total solar eclipse that occurred here on August 21, 2017, starting with a partial eclipse at 10:51:05 solar time (11:53:43 AM CDT), reaching a peak of totality at 12:20:04 solar time (1:22:41 PM CDT), and ending with a partial eclipse at 13:46:23 solar time (2:49:01 PM CDT).

Shadow-paths traced by the tip of the triangular-shaped gnomon follow four datelines on the sundial. On December 21 each year, the shadow of the tip follows along the line labeled Southern Solstice (or winter solstice).
On March 21 and September 23, it follows the Equinox line. On June 21, the shadow of the tip follows the Northern Solstice (or summer solstice) line.
Each year, the shadow-path of the tip brings to our memory the total eclipse by moving along the Eclipse line on August 21. As the tip traverses the Eclipse dateline, it encounters markers at the times of the onset, the peak of totality, and the end of the eclipse event that occurred here.
(panel 2 - Time)
This sundial shows solar time. The hour marked 12 indicates solar noon — the time when the sun at this location reaches its highest elevation of the day, 1 indicates one hour after solar noon, etc.
To get



the time shown on your watch or cellphone on the day of the eclipse, August 21, add 1 hour, 2 minutes, and 40 seconds to the solar time shown by the sundial. Read the explanation below to understand why.

Three factors relate the time indicated by this sundial to civil time - the time indicated by your watch or cellphone.
This relationship is

t CIVIL = t SUNDIAL
+D - L - EOT


D = +1 hour when "daylight savings time" is in effect and 0 when not. L accounts for the difference between the longitude 89.86°W of the dial's location and the longitude 90°W used for Central Standard Time; this difference of 0.14° implies that L is 40 seconds. EOT stands for "Equation of Time." This accounts for the earth's noncircular, tilted orbit around the sun. EOT depends where the earth is in its orbit around the sun, that is, on the date, as seen here graphically.

(panel 3 - Sundial)
Design. Donald L Snyder of St. Louis, a Member of the North American Sundial Society and the St. Louis Astronomical Society, designed the sundial. It commemorates the occurrence in Perry County, Missouri, of the Great American Eclipse that occurred



on August 21, 2017. Trish Erzfeld, Director of Perry County Tourism, coordinated the project and served as an enthusiastic supporter.
Sundial. Abraham Mohler, St. Louis sculptor and artist, made the dial plate.
Gnomon. William Turner, of Turner Associates in St. Louis, made the gnomon.
Pedestal. Earth Works Inc. made the pedestal of limestone they quarried in Perry County.
Location. This sundial is located at the Perry County Courthouse in Perryville, Missouri. Extensive renovation of the Courthouse was completed in time for its celebration with this sundial on August 19, 2017, the weekend of the total solar eclipse.
Details
HM NumberHM293F
Tags
Year Placed2017
Placed ByPerry County Missouri
Marker ConditionNo reports yet
Date Added Thursday, July 5th, 2018 at 1:02pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)16S E 247653 N 4179185
Decimal Degrees37.72520000, -89.86323333
Degrees and Decimal MinutesN 37° 43.512', W 89° 51.794'
Degrees, Minutes and Seconds37° 43' 30.72" N, 89° 51' 47.64" W
Driving DirectionsGoogle Maps
Area Code(s)573
Which side of the road?Marker is on the right when traveling North
Closest Postal AddressAt or near 1 W St Joseph St, Perryville MO 63775, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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