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The Great American Eclipse: Introduction

This guide provides links to information about the total solar eclipse that will occur on August 21, 2017.

USPS Total Solar Eclipse Stamp

The images above show the Forever stamp that will be issued in honor of the eclipse by the U.S. Postal Service. The USPS will issue a first-of-its-kind heat-sensitive stamp that changes when touched. The first day of issue will be June 20, 2017 (the day of the summer solstice). Stamps can also be pre-ordered in early June from Images courtesy of the U.S. Postal Service.

View a video of the eclipse stamps changing from dark (eclipsed sun) to light (full moon).

Solar Eclipse Magnitude (Definition)

The fraction of the apparent diameter of the sun covered by the moon. By convention it is usually quoted at maximum phase.

Source: NASA Eclipse Glossary

Total Solar Eclipse, August 21, 2017

This guide provides information about the Total Solar Eclipse that will occur on August 21, 2017. The path of totality will start in Salem, Oregon and end in Charleston, South Carolina. Macomb will see a partial solar eclipse (95% totality). This guide includes sites that provide scientific and other information about the eclipse, including some that provide links to vendors that sell glasses and other equipment that can be used to safely view and photograph the eclipse. Information about the special solar eclipse stamp that will be issued by the U.S. Postal Service is available beneath the images of the stamp to the left. If you wish to suggest another site that might be of interest, please contact me.

Eclipse Details in Macomb, Illinois

Date: August 21, 2017
Eclipse Begins 11:48 AM
Maximum Eclipse 1:15 PM
Eclipse Ends 2:40 PM
Duration: 2 hours & 59 minutes
Magnitude: 0.956
Obscuration: 95.2

NOTE: 4.8% of the Sun will still be visible.
The light from the Sun will be 20,000 times as bright as the Moon.

Time to Start of the Great American Eclipse in Macomb, Illinois

Time to the Start of the Great American Eclipse in Macomb, Illinois


Contact Information

Linda Zellmer's picture
Linda Zellmer
Government Information & Data Services Librarian
Liaison to Biology, Geography, Geology & Agriculture
Malpass Library, 415

Solar Eclipse Obscuration (Definition)

The fraction of the sun’s area covered by the moon.

Source: NASA Eclipse Glossary