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DENVER — On Aug. 21, the sun will disappear for a short time.

For a swath of the country from Portland, Ore., to Charleston, S.C., it will feel like someone just turned off the sun in the middle of the day.

Even if you live elsewhere in the U.S., a portion of the sun will partially disappear.

It is being called the “Great American Eclipse.” And you can mark it on your calendar down to the millisecond.

It’s been 99 years since a total solar eclipse crossed the country from the Pacific to the Atlantic. The total solar eclipse on June 8, 1918, crossed from Washington to Florida.

During the celestial event, the moon will pass between the sun and the Earth, appearing to block the sun for almost an hour and a half.

Space enthusiasts are already starting to get excited for the eclipse, some counting down the days, while others are booking hotels for the big moment.

Solar eclipse in Denver

In Denver, the eclipse begins at 10:23:23 a.m. The maximum effect happens at 11:47:47 a.m. and the event ends at 1:14:43 p.m.

It’s a partial eclipse in the Mile High City. Denver will get 92.3 percent of the total eclipse.

To get in the path to see the total eclipse, you will need to drive up Interstate 25 to just west of Glendo, Wyo., and be there at 11:45 a.m. Totality begins at 11:45:05 a.m. and lasts for approximately 2 minutes, 28 seconds until 11:47:33 a.m.