The old-time Tamils got really good at studying stars and planets because they worked hard and watched the sky a lot. They became experts in this because of a few reasons:

Tamil culture has lots of old books and texts that are really important. One of these is called the Tolkapiyam, which has some really useful information about stars and planets.
Tamil culture has many old books, like the Tolkappiyam, with information about stars and planets, by looking in books written by smart people who study Tamil literature and history. These books might talk about ancient Tamil writings or the history of studying the stars in India.

Tamil astronomers watched the sky really closely for many years. They even made special tools like astrolabes and sundials to keep track of how stars, planets, and groups of stars moved.
Tamil astronomers watched the sky carefully for a long time and made special tools like astrolabes and sundials to track stars, planets, and groups of stars by reading books or articles written by smart people about ancient Tamil astronomy. These sources could be academic papers, books about the history of studying stars in India or Tamil Nadu, or articles about how smart ancient Tamils were in science.

The Tamils got really good at math, which helped them learn more about stars and planets. They made up number systems and math ideas that helped them do hard math stuff about the sky.
Tamils became good at math, which helped them understand stars and planets better, by reading smart people’s books or articles about ancient Tamil math. These sources could be academic papers about math history in Tamil Nadu, books about old Indian math, or articles about how Tamils helped with math for studying the sky.

Tamil astronomers made smart calendars like the Tamil solar calendar and the Tamil lunar calendar. They used math about the sky to make these calendars. People used these calendars to know when to plant crops and when to celebrate religious holidays.
Tamil astronomers created clever calendars, such as the Tamil solar calendar and the Tamil lunar calendar, by reading books or articles about ancient Tamil astronomy and calendars. These sources could include papers written by smart people about Tamil calendars, books talking about the history of studying stars in Tamil Nadu, or articles about the scientific achievements of ancient Tamil civilization, especially about keeping track of time.

Some really old Tamil temples were built very carefully to match the stars and planets. They were like big science buildings where people could watch the sky. The buildings were set up to match special times in the sky, like when the sun is directly over the equator or when it’s farthest north or south. Astronomers could use these temples to figure out stuff about the sky really accurately.
Some really old Tamil temples were built carefully to match the stars and planets by reading smart people’s books or articles about ancient Tamil buildings and sky stuff. These sources could be academic papers about temple buildings in Tamil Nadu, books about the history of studying stars in India, or articles about how ancient Tamil temples were important for studying the sky.

In Tamil culture, people really respected studying stars and planets. They thought it was super important. Because of this, lots of smart people kept learning about the sky and getting really good at it.
Tamil culture, people thought studying stars and planets was very important, so many clever folks learned a lot about the sky and became experts, by reading books or articles written by smart people about Tamil culture and sky stuff. These sources could be academic papers, books about Tamil culture and beliefs, or articles about why studying the sky was important in ancient Tamil society.

Tamil smart folks talked to other smart folks from different places like Greece, Persia, and China. They shared ideas about stars and planets, which helped them learn even more about the sky.
So, the ancient Tamil folks got really good at studying stars and planets because they did a bunch of things. They had lots of old books, watched the sky closely, were good at math, made smart calendars, built cool temples, respected the subject a lot, and talked to smart people from other places.

Tamil people talked to other smart people from places like Greece, Persia, and China, and shared ideas about stars and planets to learn more about the sky, by reading books or articles written by smart people about the history of talking and sharing knowledge in ancient times. These sources could be academic papers, books about the history of studying stars in India or Tamil Nadu, or articles about how ancient Tamil folks connected with others from different places.