天文 (tiān wén): astronomy

He has been particularly interested in astronomy since childhood, and every night he would take a telescope to the rooftop to observe the stars.

The astronomy department of this university is very famous and attracts many students to apply every year.

By studying astronomy, we can understand the origin of the universe and the laws of planetary motion.

Last night's popular science lecture introduced ancient China's achievements in astronomy, such as the seismograph invented by Zhang Heng.

His bookshelf is filled with astronomy books, ranging from introductory guides to professional star charts.