What is the brightest star on the side of the moon on August 15?

On the evening of August 15, the brightest star next to the moon is Venus. Venus is bright because it is close to the earth, which is the second closest natural celestial body besides the moon.

Like Mercury, Venus and the Earth both have their own period of revolution, so from the perspective of the Earth, Venus will appear on the east and west sides of the sun with a period of 584 days (that is, the rendezvous period of Venus). Venus's apparent radius can be as long as 33 seconds and as small as 5 seconds.

Extended data:

The structure of Venus

There is no direct data about the internal structure of Venus. Theoretically, it is concluded that the internal structure of Venus is similar to that of the Earth, with an iron-nickel core with a radius of about 3 100km, the middle layer is a "mantle" mainly composed of silicon, oxygen, iron, magnesium and other compounds, and the outer layer is a very thin "shell" mainly composed of silicon compounds.

Scientists speculate that the internal structure of Venus may be similar to that of the Earth. According to the structure of the earth, the main components of Venus mantle are silicates dominated by olivine and pyroxene, and a crust dominated by silicates, the core of which is composed of iron-nickel alloy. Venus has an average density of 5.24g/cm3, ranking third among the eight planets (Pluto was classified as a dwarf planet in 2006, so it is called the eight planets).