110 years ago today, on September 14, 1915 (August 6, 1915 in the lunar calendar), John Dobson, the inventor of the Dobson telescope, was born. John Lowry Dobson (September 14, 1915-January 15, 2014) was an American astronomer and inventor of the Dobson Telescope. Dobson was born in Beijing, China in 1915. His grandfather participated in the founding of Peking University. In 1927, Dobson moved to San Francisco with his parents. In 1943, he graduated from the Department of Chemistry at the University of California, Berkeley. In 1944, he became a monk in a temple in San Francisco and became a Hindu monk, but returned to secular life 23 years later. During his life in the temple, he devoted himself to telescope manufacturing technology, manufacturing a 12-centimeter reflecting telescope, and improving the telescope's support system to make it more stable, flexible and easy to carry. The telescope equipped with this stent is named after him and is called the Dobson Telescope. In 1968, Dobson and friends founded the San Francisco Roadside Astronomers Organization in San Francisco to advocate and hold public astronomy science popularization activities such as roadside astronomy. According to research on the backbone of the Youth Astronomy Society of Peking University, the grandfather of Mr. Dobson, who is said to have participated in the establishment of Peking University, may actually be Dr. Hiram Harrison Lowry, one of the predecessors of Yanjing University and the founder and president of Huiwen Academy. The Dobson telescope refers specifically to a reflecting telescope supported by a simple theodolite (astronomy). It is similar in shape to a cannon. It was first made by American astronomer John Dobson in the 1950s and was widely promoted in the 1980s to popularize astronomy. Due to its low cost, simple and strong structure and easy to carry, it is very suitable for astronomy enthusiasts to make it themselves. In principle, the Dobson telescope has no restrictions on the optical design of the telescope, but it is generally a Newton-type reflecting telescope with an aperture ranging from 10 cm to more than 1 meter. In order to reduce weight, many large Dobson telescopes adopt truss-like designs. This kind of telescope is generally not equipped with a tracking device, so it is mainly used for visual observation. Its optical surface is mostly paraboloid, and its focal ratio can reach F4-F6. It has strong condensing power, making it especially suitable for low-power deep space celestial observations. However, some people have also added tracking systems to this type of telescope for high-power planetary observation or planetary photography and lunar photography.