Shi Shen

He was a contemporary of Gan De born in the State of Wei, also known as the Shi Shenfu.

[2] Shen also made the earliest surviving deliberate sunspot observation,[3] sometimes erroneously credited to Gan De.

He assumed that these spots were eclipses that began at the center of the Sun and spread outward.

Most of his works did not survive intact, but a few of his crucial writings were preserved in the Treatise on Astrology of the Kaiyuan Era.

[7] Gan De and Shi Shen are widely quoted across a number of astronomical texts after their time, though they should not be confused with other books sharing similar names that were not written by them.