This week, armchair astronomers will be treated to a celestial fireworks display of epic proportions. On September 21, the sky will be graced by a partial solar eclipse, marking the last celestial overshadowing event of this year.

A solar eclipse occurs when the moon passes between the sun and the Earth, temporarily obscuring our galaxy's light source like a person standing in front of a lamp (during a lunar eclipse in the Earth passes between and the sun and the moon).

Unlike during a total eclipse, during which the sun is completely overlapped, a partial eclipse only blots out part of the solar surface.

However, in this case, as much as 86% of the sun will be obscured, giving the impression of the moon taking a "bite" out of our brightest star, People.com reported.

But don't grab your special solar eclipse glasses just yet, New Yorkers -- most of the world, including the entire Northern Hemisphere, will be left in the dark.

In fact, 2025's final eclipse will be visible to just 16.6 million people -- 0.2% of the world's population -- located across New Zealand, various Pacific Islands, part of Australia, and pockets of Antarctica, according to Time and Date.

Stargazers fortunate to be in one of the viewing regions should head to their vantage points by early afternoon. The cosmic overlap kicks off at 1:29 pm EST time with the maximum eclipse phase -- when the moon obstructs the largest chunk of the star -- going down at 3:45 pm, although the times differ by location, Space.com reported. Time and Date provides a full breakdown.

Staring directly at the sun with naked eyes can cause serious damage -- even during a partial eclipse. To shield one's peepers, eclipse-watchers should nab a pair of special glasses that are certified with the ISO 12312-2 international standard, ensuring that these shades filter out harmful radiation and reduce sunlight to safe levels.

Meanwhile, solar filters should be used for telescopes and binoculars.

Those who can't grab the requisite eyewear in time -- or live in a place where the eclipse can't be seen -- can still catch the event on live streams hosted by Space.com and other space agencies online.

Northern Hemisphere-dwellers who want to see the spectacle in the flesh will have to wait until August 2026 to see the next one, which will be visible in North America, Europe and Africa. The next lunar eclipse -- a total one -- will transpire on March 3, 2026, and will be visible from the Americas, Asia, Australia and the Pacific Islands.

Meanwhile, the astrologically-minded should remain particularly vigilant during the lead-up this year's cosmic grand finale.

The two-week corridor between September 7 and September 21, the window between the lunar eclipse in Pisces and the solar eclipse in Virgo, can amplify stress and uncertainty and increase the likelihood of making disastrous decisions.

"During the Eclipse Corridor, it's essential to resist the temptation to make significant life changes on impulse," Tetiana Tsvil, an astrologer at a spiritual guidance platform, Nebula told The Post. "Heightened emotions can cloud judgment and lead to choices you'd rethink later."

This means holding off on starting or ending a serious relationship, signing an important agreement or making a large purchase.

How to view the upcoming solar eclipse -- the last of 2025