After this discovery, my friend, Dr. William Watson Jr. helped me to secure a £200 annual pension from King George III. It was at this time that I made the decision to give up my music and devote myself to astronomy.
I was appointed the royal astronomer to King George III. I moved to Datchet, England near the Windsor Castle. I was 43 and officially a professional astronomer.
Being an astronomer was not always easy, there were as many theories and ideas as there were astronomers! Some astronomers believed that all stars don't shine with the same brightness, but I believed that they were incorrect and that all stars shine the same way. I still don't think they knew what they were talking about.
In 1787, I moved to old Windsor, and in 1788, I moved to Slough, where I lived for the rest of my life. My sister lived with me through all this time and helped me with my observations. She was also interested in astronomy.
My sister and I studied the skies together every night. During the day, she would write up our observations, and I would work on building telescopes some of which I sold.
In 1789, I completed my biggest, most powerful telescope. It was 40 feet long and had two 48-inch, concave metal mirrors. It was the largest telescope in the world for 50 years.