Skygazers will enjoy another lunar spectacle this month – the second supermoon is expected to appear in the sky overnight from August 30-31.

Generally speaking, a supermoon refers to a full moon when it is within 90 percent of the perigee, the closest point in its elliptical orbit to Earth.

The supermoon, known as a blue moon, is the biggest in 2023 as it is closest to Earth, with a distance of about 357,344 kilometers, compared to the average moon-Earth distance of 384,400 kilometers.

The exact moment of the full moon this time occurs at 9:36 a.m. Thursday Beijing Time.

Generally, the best time to view a supermoon is when it rises above the horizon. No extra equipment is required. Find an open area with a relatively high position and enjoy it with the naked eye.

A bonus this time is that you can see the moon and Saturn pair up, with the latter also at its brightest, casting an ochre glow.

The final supermoon of this year will grace the sky on September 29.

Super blue moon

If a month has two full moons, the second one is called a blue moon.

"A blue moon doesn't mean that people can see the moon in the color of blue. The color of the moon is no different from the normal full moon," said Xiu Lipeng, a member of the Chinese Astronomical Society.

"It happens every two to three years," Xiu said.

However, according to NASA, it takes much longer to see super blue moons.

Blue moon and supermoon coincidences occur about every 10 years on average, "though the time between any two occurrences can vary from two months to two decades or more," said NASA.

"The next super blue moons will occur in a pair, in January and March 2037," it added.

Read more: In pictures: The first supermoon in August rises around the world