How to pronounce Libra? How to pronounce the middle character of Libra?

The pronunciation of Libra is always discussed by people. Many people read it as "Tianpingzuo". So let's see how to pronounce Libra? How do you pronounce the middle character of Libra?

Libra

Libra pronunciation: cheng
鄭
An instrument for measuring weight: city ~. Pound~. ~lump.
Zheng code: MFAU, U: 79E4, GBK: B3D3
Number of strokes: 10, Radical:禾, Stroke order: 3123414312

According to the Cihai dictionary, Libra is:
Libra, the seventh sign of the zodiac. The ecliptic longitude ranges from 180 to 210, and its original name was Libra, hence the name. But due to the precession of the equinoxes, it has now moved to Virgo. The sun reaches the palace around September 24th every year. It is the autumnal equinox.
Scale is a measuring tool, and Libra also represents love and peace. Libra people have a strong sense of justice.

The reason why the middle character of Libra is pronounced as chèng

Why is it pronounced as chèng? This has to start with the origin of Libra.

In ancient times, humans and gods all lived in hospitals, but as humans became smarter, they learned to build houses, but they also became more and more cunning, and learned to intrigue and lie, which made many gods unforgivable, so they left humans and went to heaven.
Among the gods, there was a goddess who represented justice. She was not completely discouraged with humans. She still lived with humans. However, humans were becoming more and more terrible. Wars and killings were always happening on earth, which made the goddess of justice unbearable. But she still hasn't completely given up on humans. She still believes that sooner or later they will wake up.

The goddess of justice returned to heaven and met the god of the sea. The god of the sea laughed at himself and said that it was stupid for the goddess of justice to trust humans. Then the two had a heated debate. The goddess thought that the god of the sea had insulted him and must apologize, but the god of the sea refused to admit it. The two finally went to Zeus.

Zeus is the daughter of the goddess of justice, and Poseidon is Zeus's younger brother, which makes Zeus very embarrassed. How to criticize the two of them? The queen helped Zeus come up with an idea. She let the god of the sea and the goddess of justice compete, and whoever loses would apologize.
The competition was held in the square of heaven. The god of the sea first swung his stick at the wall, and beautiful water flowed out of the cracks. The goddess of justice turned into a tree with a reddish-brown trunk, lush green leaves and golden olives. The watching gods all felt love and peace, and even the god of the sea admitted defeat. In order to commemorate the result of the competition, Zeus threw the scales he carried with him into the sky, which is the current constellation Libra.