Fernbank Science Center is hosting a dedication ceremony on Saturday for the U.S. Post Office’s new eclipse stamp.

The Total Eclipse of the Sun forever stamp, designed by Antonio Alcalá of Alexandria, Va., transforms from a picture of the sun in eclipse into an image of the moon with the heat of a finger or thumb.

Once it cools, it returns to a picture of the eclipse — with the moon appearing as a black disk obscuring the sun, whose wispy corona appears like ethereal white flower petals.

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The first-day-of-issue dedication ceremony took place June 20 at the University of Wyoming in Laramie. The 70-mile-wide shadow path of the eclipse, known as the “path of totality,” will traverse the country diagonally, appearing first in Oregon (mid-morning local time) and exiting some 2,500 miles east and 90 minutes later off the coast of South Carolina (mid-afternoon local time).

Fernbank’s ceremony kicks off a full day of activities at the Jim Cherry Memorial Planetarium, including remarks from astronomer April Whitt and an 11 am video presentation.