LOS ANGELES â€"  Sunrises and sunsets often dazzle, but they'll have a special ring to them in a few days for people in the western United States and eastern Asia: The moon will slide across the sun, blocking everything but a blazing halo of light.

It's been almost two decades since a "ring of fire" eclipse was visible in the continental United States. To celebrate the end of that drought, nearly three dozen national parks in the path of the eclipse will host viewing parties.

The solar spectacle is first seen in eastern Asia at dawn Monday, May 20, local time. Weather permitting, millions of early risers in southern China, northern Taiwan and southeast Japan will be able to catch the ring eclipse. Then it creeps across the Pacific with the western U.S. viewing the tail end.

The late day sun will transform into a glowing ring in southwest Oregon, Northern California, central Nevada, southern Utah, northern Arizona and New Mexico and finally the Texas Panhandle where it will occur at sunset on Sunday. For 3 1/2 hours, the eclipse follows an 8,500-mile path. Viewing, from beginning to end, lasts about two hours. The ring phenomenon lasts as long as 5 minutes depending on location.

'A bright ring around the sun at mid-eclipse is still pretty cool.'

- Geoff Chester, the U.S. Naval Observatory

Outside this narrow band, parts of the West, Midwest and South -- and portions of Canada and Mexico -- will be treated to a partial eclipse. The Eastern Seaboard will be shut out, but people can log online to sites such as the Slooh Space Camera, which plans to broadcast the event live.

A ring eclipse -- technically called an annular solar eclipse -- is not as dramatic as a total eclipse, when the disk of the sun is entirely blocked by the moon. As in a total solar eclipse, the moon crosses in front of the sun, but the moon is too far from Earth and appears too small in the sky to blot out the sun completely.

"A bright ring around the sun at mid-eclipse is still pretty cool," Geoff Chester of the U.S. Naval Observatory said in an email.

Asia is abuzz over the event. In Japan, cable cars will run early to give tourists an unobstructed view from the mountains. Ferries will make special trips so that others can enjoy the scene offshore. The Taipei Astronomical Museum will open its doors at dawn while Hong Kong's Space Museum will set up solar-filtered telescopes outside its building on the Kowloon waterfront.

The last time this type of eclipse was seen in the U.S. was in 1994. This year's solar show offers ringside seats at 33 national parks along the eclipse path including the Grand Canyon and Bryce Canyon. A partial eclipse can be viewed from another 125 national parks.

For die-hard sky gazers, six U.S. locations will see the moon cover about 95 percent of the sun's diameter. They include the Petroglyph National Monument, Redwoods National Park, Lassen Volcanic National Park, Canyon de Chelly National Monument, Zion National Park and Glen Canyon National Recreation Area.

Where to Watch

It's been almost two decades since a "ring of fire" eclipse was visible in the continental United States. On Monday, May 20, the moon will slide across the sun, blocking everything but a blazing halo of light. To celebrate the end of that drought, nearly three dozen national parks in the path of the eclipse will host viewing parties.

U.S. viewing details

World viewing details

Wherever you are, do not look directly at the eclipsed sun or you can get a serious eye injury. Wear specially made protective glasses that can be bought online or create your own contraption by punching a small pinhole in a cardboard box.

If you buy special eyewear, you can recycle it. Two weeks later, Venus will crawl across the face of the sun -- a rare occurrence known as the "transit of Venus" that will also require viewers to take precaution.

Veteran eclipse chaser Jay Pasachoff has traveled to remote corners of the globe to see the moon take a bite of the sun. This time, the Williams College astronomer will travel to New Mexico with his students to collect data.

Sunday's event will be his 14th ring eclipse and 55th solar eclipse overall. So what does someone who has seen it all look forward to?

Seeing "the symmetry of a ring of sunlight around the dark silhouette of the moon," Pasachoff said in an email.

The next ring eclipse won't be visible in the U.S. for more than a decade -- October 2023.