Blood moon observed during total lunar eclipse

In ancient times, a blood moon was considered an omen, its copper glow instilling a sense of foreboding in people who felt it signaled an impending disaster. Today, however, huge advancements in the study of astronomy have meant the occurrence of the celestial event is eagerly awaited by astronomy enthusiasts and ordinary people alike, all keen to witness and document its rare beauty.

From 11:30 pm on Sunday to 5 am on Monday, this year's first and only blood moon visible in China captivated stargazers across the country. Some leaned out of windows to stare at the sky, while others set up professional equipment to capture the spectacle.

Tang Haiming, a researcher at the Chinese Academy of Sciences' Shanghai Astronomical Observatory, said that a blood moon occurs during a total lunar eclipse when Earth aligns between the sun and the moon, casting its shadow over the moon. Colors with longer wavelengths make it through Earth's atmosphere and make the moon appear orangish or reddish. The moon displays different shades of red depending on atmospheric conditions, he added.

Tang, who is also secretary-general of the Shanghai Astronomical Society, said the blood moon was observed not only in Asia, but also in the Eastern Atlantic, Oceania, the Indian Ocean, Europe, Africa, the Western Pacific and Antarctica.

"The blood moon is a normal astronomical phenomenon. During a total lunar eclipse, the gravitational forces of the moon and the sun combine and can lead to astronomical tides. However, there is no need to panic. Many people from Shanghai went to the Qiantang River to see the tide," Tang said.

According to him, the probability of a lunar eclipse occurring is relatively low, even more so for a total lunar eclipse, the last of which occurred in 2022.

"Since this total lunar eclipse occurred at midnight, the observatory employed a six-hour slow live broadcast format. Extensive astronomical explanations and introductions to lunar exploration projects were prepared beforehand, with the hope of using this opportunity to encourage people to look more at the sky," he added.

When 37-year-old Beijing resident and astronomy enthusiast Zhang Yanliang first heard about the latest blood moon occurrence, he immediately began making preparations to see and photograph the celestial event.

Zhang said he has witnessed numerous astronomical phenomena such as the passing of Comet Hale-Bopp in 1997, the Leonid meteor shower, and solar and lunar eclipses. Although a total lunar eclipse was nothing new for him, he still did not want to miss it.

Setting up two cameras with 800-millimeter telephoto lenses — one for time-lapse videos and the other for still photos — Zhang took hundreds of shots, capturing the fine details of the moon.

"It's worth mentioning that the weather in Beijing early this morning was excellent, with high atmospheric transparency, making it very suitable for viewing and photography," he said, adding that with the development of smartphones, capturing celestial events has become easier, and many high-quality photos shared on social media had actually been taken with phones.

According to Tang from the CAS, the next total lunar eclipse visible in some parts of China is expected next year on March 3, right after sunset, and more activities are anticipated due to the favorable timing.