The star map in summer is completely different from that in winter. Explain in detail the map drawn by projecting the spherical apparent position of celestial bodies onto the plane, and indicate their position, brightness and shape. The Dunhuang star map drawn by China in the Tang Dynasty is one of the oldest existing ancient star maps in the world. The Book of the Later Han Dynasty: "The star map is organized, and the sun and the moon follow the ecliptic. The official has no tools and does not know how to implement it. "

Word decomposition

Explanation of stars: Astronomically speaking, stars refer to celestial bodies that can emit or reflect light in the universe; Generally speaking, it refers to the celestial bodies that glow in the sky at night: planets. Stars. A planet. Satellite. Dai Yue. Small particles: Mars. A counting point on a weighing instrument, such as a fixed disk star. Emblem on an officer's collar: an explanatory picture (picture) of a five-star map → an image expressed by painting: a picture. Mode. Atlas. Illustration. Reference Map: Sketch of Asia. It's hard to see. Painting: drawing shadow graphics. Plan: A grand plan (also called "grand plan" or "grand plan"). Liangtu. Seek, hope: plot. Tully. Try.