2017 Total Solar Eclipse in Tennessee

by Fred Espenak

Index
Path in Tennessee
Weather Prospects
Fun Facts
Eclipse Viewing Events
Google Eclipse Map
Eclipse Circumstances for Cities
Animation of the Moon's Shadow
States in Path of Totality
Publications on the 2017 Eclipse
Additional Links


The 2017 Eclipse Path in Tennessee

Map courtesy of Michael Zeiler GreatAmericanEclipse.com

The 2017 Total Solar Eclipse in Tennessee

On 2017 August 21, a total eclipse of the Sun is visible from within a narrow corridor that traverses the United States of America. The path of the Moon's umbral shadow begins in northern Pacific and crosses the USA from west to east through parts of the following states: Oregon, Idaho, Montana, Nebraska, Nebraska, Kansas, Missouri, Illinois, Kentucky, Tennessee, North Carolina, Georgia, and South Carolina (a tiny corner of Montana and Iowa are also in the path). A partial eclipse visible from a much larger region covering all of North America (See Map).

Ever since its Oregon landfall 71 minutes earlier, the eclipse track has been gradually curving further and further south of east. Its azimuth is 115° as it crosses into Tennessee and the umbra begins the final 20 minutes of its trek through the USA.

Nashville (pop. 659,000), known as "Music City" around the world, is inside the path although 40 km (25 mi) south of the central line. Its location means a 44-second penalty but the duration is still a respectable 1 minute 56 seconds. But since Nashville covers a large geographic area, the actual duration is sensitive to an observer's exact position.

Knoxville, Chattanooga, and Atlanta are all near misses (eclipse magnitudes 0.997, 0.993 and 0.971) as the eclipse track crosses the Blue Ridge Mountains separating Tennessee from Georgia and North Carolina.

Safe Eclipse Viewing

Every total eclipse of the Sun begins and ends with a partial eclipse. The partial phases require either a projection technique or a special solar filter to be viewed safely. Read more about this at Safe Solar Eclipse Viewing.

Of course during the few brief minutes of Totality when the Sun's disk is completely covered by the Moon, it is then safe to look directly at the Sun with the naked eye or through a telescope or binoculars.

Weather Prospects in Kentucky and Tennessee

(Excerpts from Eclipse Bulletin: Total Solar Eclipse of 2017 August 21)

It is early afternoon - around 1:30 pm - when the track reaches Kentucky and afternoon clouds, if there are any, will be building in the sky. Afternoons in Kentucky and much of Tennessee are no cloudier than the early morning according to observations from the weather satellites. What changes is the type of cloud: convective clouds build in the afternoon as the ground heats and warm thermals begin to rise. In contrast to eclipse sites in western states, the cloudiness measured in states east of the Mississippi shows a higher frequency of overcast conditions - just short of 20% of recordings in much of Tennessee and Kentucky. Compare this to just 10% to 15% in Wyoming and to 5% to 10% on the Columbia Plateau in Oregon.

The terrain across western Kentucky is relatively flat - a landscape of small, rolling hills that make up the Pennyroyal (Pennyrile) Plateau. Off the Interstates, roads are tree lined, limiting the view, but accompanied by generous openings that look across the many farms in the region. As the track enters Tennessee, the land begins to rise, crossing the low hills of the Highland Rim before dropping into the Nashville Basin.

Beyond Nashville, the track climbs the higher Cumberland Plateau, and then promptly sinks into the Tennessee Valley. In the satellite record, none of these ups and downs in the terrain have much influence on the cloud cover, which is high and climbing slowly, formed by the generous sub-tropical humidity of the area and a steady rise in the land's elevation toward the Appalachians. The surface observations are a little less daunting, showing a 12% decrease in average cloud cover at Chattanooga compared to the 58% at Nashville. Across both states, broken cloudiness is the dominant afternoon sky condition, while clear skies are uncommon - only 5% to 10% of the observations at eclipse time.

On the border with Georgia and the Carolinas, the track reaches the Blue Ridge Mountains, a section of the Appalachians, and both the terrain and average cloud cover climb sharply. This region has the highest cloud cover along the track, reaching nearly 80% in the satellite measurements. In the Moon's course across Kentucky and Tennessee, the percent of possible sunshine declines from a tolerable 71% at Paducah to 63% at Nashville, and presumably a fair bit lower over the Appalachians, though there are no measurements to show that.

A great source of weather forecasts in the days leading up to the eclipse is Jay Anderson's Eclipsophile.com.

Excerpts from Eclipse Bulletin: Total Solar Eclipse of 2017 August 21. This material may not be reproduced without permission.

Fun Facts for the 2017 Total Eclipse in Tennessee

  • The average width of the path of totality is 71.5 miles across Tennessee.
  • The central line covers a distance of 188 miles across Tennessee.
  • The average central line duration of totality is 2 minutes 39 seconds across Tennessee.
  • The average speed of the Moon's shadow is 1447 mph across Tennessee.
  • Before 2017, the last two total solar eclipses visible from Tennessee were on 1869 Aug 01 and 1717 Oct 04.
  • After 2017, the next two total solar eclipses visible from Tennessee will be on 2153 Oct 17 and 2200 Apr 14.

Eclipse Viewing Events and Local Pages in Tennessee

Google Map of 2017 Total Eclipse in Tennessee


Google Map of 2017 Total Eclipse in Tennessee
(Click to use interactive map)

The map above links to an interactive Google map showing the visibility of the Total Solar Eclipse of 2017 Aug 21 in Tennessee. The interactive map allows the user to zoom and drag the map as desired. Click the cursor on any location to generate eclipse circumstances from that location.

Eclipse Circumstances for Cities in Tennessee

The table below lists eclipse circumstances for a number of cities in Tennessee. The following information is given for each city.

  • The type of eclipse seen from the city (Partial or Total).
  • The times when the partial eclipse begins and ends.
  • The times when the total eclipse begins and ends.
  • The time of maximum eclipse.
  • The altitude on the Sun above the horizon (in degrees) at each of these times.
  • The Eclipse Magnitude at maximum eclipse. Eclipse Magnitude is the fraction of the Sun’s diameter occulted by the Moon.
  • The Eclipse Obscuration at maximum eclipse. Eclipse obscuration is the fraction of the Sun’s area occulted by the Moon.
  • The Duration Total Eclipse is the length of the total phase in minutes and seconds (i.e., totality).

The times appearing in this table include Daylight Saving Time (DST) for all cities in which DST is observed. Report time zone or DST corrections for any city to EclipseWise.

Thanks to Bill Kramer (Eclipse-Chasers.com) for helping to develop the code to generate the above eclipse circumstances table. To calculate predictions for other cities see 2017 Eclipse Circumstances Calculator.

The partial phases require either a projection technique or a special solar filter to be viewed safely. On the other hand it is completely safe to watch Totality with the naked eye. For more information see Safe Solar Eclipse Viewing.

Animation of the Moon's Shadow Across Tennessee


The animation above shows the Moon's umbral shadow as it tracks across Tennessee. Observers must be inside this path to see the total eclipse. Outside the path only a partial eclipse is seen.

Animation courtesy of Michael Zeiler GreatAmericanEclipse.com.

States in the Path of Totality

The index below gives links to special pages for each of the 12 states in the path of the 2017 total solar eclipse. Note that the eclipse path also crosses a tiny corner of Montana and Iowa, but they are not included in this table.

States in the Path of Totality

Georgia

Tennessee

Oregon

Idaho

Missouri

South Carolina

Illinois

Nebraska

Tennessee

Kansas

North Carolina

Wyoming


11" x 17" poster map of the 2017 eclipse path through Tennessee
(GreatAmericanEclipse.com)

Additional Links for the 2017 Total Solar Eclipse




Safe Solar Eclipse Glasses



Rainbow Symphony Eclipse Shades



Thousand Oaks Optical Solar Filters



Great American Eclipse Store

Links to Additional Solar Eclipse Information

Acknowledgments

Some in the JavaScript code used here is based on the work of Deirdre O'Byrne and Stephen McCann. Bill Kramer (Eclipse-Chasers.com) has expanded this code to work with dozens of cities.

The Besselian elements and values of ΔT used in these calculations are from Eclipse Bulletin: Total Solar Eclipse of 2017 August 21.

Permission is freely granted to reproduce this data when accompanied by an acknowledgment:

"Eclipse Predictions by Fred Espenak (EclipseWise.com)"


Return to: Total Solar Eclipse of 2017 August 21