astronomy
https://gyazo.com/0ce126d4d0b8b5e091d4877672266a18
noun
天文学
In ancient times, observation of the sun, moon, stars, and planets formed the basis of timekeeping and navigation. Astronomy was greatly furthered by the invention of the optical telescope, but modern observations are made in all parts of the spectrum, including X-ray and radio frequencies, using terrestrial and orbiting instruments and space probes.
ORIGIN