Astronomy is one of the six basic natural sciences, having close connections with physics, mathematics, chemistry, geology, biology and engineering science. To accelerate development of astronomy, Tsinghua University established the Tsinghua Center for Astrophysics （THCA）in 2001, attached to Physics Department. Over the past 20 years, the THCA gained great progress in the research of astronomy and student training. The graduates from physics department won the Sloan Prize, Hubble fellowship, and Einstein fellowship etc. and some have become distinct scholars of astronomy.
On Mar. 28 2019, the astronomy department was formally established, and the discipline development of astronomy in Tsinghua University entered a new era. As the founding unit, physics department will keep development and student training in some distinctive astronomical directions that are closely crossed with physics, including time-domain astronomy, stellar astrophysics, nuclear astrophysics, cosmology and gravitational astronomy etc.