Taipei: This year’s largest full moon, the biggest and brightest in six years, will appear on Wednesday, as announced by the Taipei Astronomical Museum.

According to Focus Taiwan, the phenomenon occurs when a full moon coincides with the moon’s closest approach to Earth, a point known as its perigee. This event is commonly referred to as a “supermoon.”

In an official statement, the museum explained that the upcoming full moons in November and December 2025 will also be classified as supermoons. On Wednesday, the full moon is expected to reach its peak at 9:19 p.m., approximately nine hours after it arrives at its perigee, which is a distance of 356,978 kilometers from Earth.

The museum further detailed that this full moon will appear about one-sixth larger and one-third brighter compared to April’s smallest full moon, with an apparent diameter of 0.57 degrees, making it the largest since February 2019. Typically, the moon measures half a degree in the sky.

To celebrate this celestial event, the museum plans to host a super full moon observation event from 7 p.m. to 8 p.m. in front of the Sun Yat-sen Memorial Hall. Telescopes and guided sessions will be available for the public to enhance their viewing experience.

The museum highlighted that while the size difference between the largest and smallest full moons is akin to that between NT$50 and NT$10 coins, the “moon illusion” expected on Wednesday will make the moon appear especially impressive. The moon illusion is an optical phenomenon where the moon seems larger when it is near the horizon than when it is higher in the sky.