Aperture 24 view the world around the clock.

A helicopter of the Republic of Singapore Air Force tows a national flag during the National Day parade rehearsal in Singapore July 27, 2019. (Xinhua/Then Chih Wey)

People cool themselves in shallow water at the Baishuiyang scenic spot in Pingnan County, southeast China's Fujian Province, July 26, 2019. (Xinhua/Jiang Kehong)

People jump into the Adriatic Sea during the 13th DM Millennium Jump event in Zadar, Croatia, on July 27, 2019. More than 3,000 people participated in the event this year. (Photo by Dino Stanin/Xinhua)

Photo taken on July 27, 2019 shows a rainbow over the Ming'antu observing station of the National Astronomical Observatories of the Chinese Academy of Sciences, in Zhengxiangbai Qi, north China's Inner Mongolia Autonomous Region. (Xinhua/Liu Lei)

Tri-colored glazed potteries are seen at a workshop in Nanshishan Village of Mengjin County in Luoyang City, central China's Henan Province, July 23, 2019. Sancai, or tri-colored glazed pottery, is made of white clay and coated with a layer of glaze. The producing technique of Sancai, which prevailed in the Tang Dynasty (618-907 AD), was very complex and listed as one of China's National Intangible Heritages in 2008. (Xinhua/Li An)

A car runs in floodwater after heavy rain in Sanaa, Yemen, July 26, 2019. Heavy rains and flood frequently hit many governorates in Yemen this summer. (Photo by Mohammed Mohammed/Xinhua)

Unique landscape of "earth forest" in Zanda County of Ngari Prefecture, southwest China's Tibet Autonomous Region, July 23, 2019. (Xinhua/Chogo)

Smoke spews from the crater of Mount Tangkuban Parahu in Subang of West Java, Indonesia, July 27, 2019. (Photo by Syarif/Xinhua)

A flower with ashes of volcanic materials spewing from crater of Mount Tangkuban Parahu is seen in Subang of West Java, Indonesia, July 27, 2019. Tangkuban Parahu volcano in Indonesia's West Java Province erupted Friday afternoon, spewing volcanic ashes 200 meters into the air. (Photo by Syarif/Xinhua)

A visitor takes photos of a painting by Palestinian artist during an exhibition in Gaza City, July 27, 2019. About 64 artists presented their works at the art exhibition. (Str/Xinhua)

Photo taken on July 27, 2019 shows the military procession accompanying the coffin of late Tunisian President Beji Caid Essebsi during his state funeral in Tunis, Tunisia. Tunisian people paid on Saturday their last tribute to late President Beji Caid Essebsi, who passed away Thursday morning at the age of 92. (Photo by Adele Ezzine/Xinhua)

Swimmers of the United States celebrate after the mixed 4x100m freestyle relay final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. Team of the United States set a new world record with 3 minutes 19.40 seconds. (Xinhua/Bai Xuefei)