Astral Oil Works was an American oil company specializing in illuminating oil, and based in Brooklyn, New York. Astral Oil was a high-quality kerosene used in lamps and noted for being relatively safe. It was founded by Charles Pratt. Charles Pratt and Company became part of John D. Rockefeller’s Standard Oil Trust in 1874, although the fact that Astral Oil was a New York branch of Standard Oil in Ohio was not made public until 1892.

Brooklyn is a borough of New York City. Located on the westernmost end of Long Island, it is coextensive with Kings County in the U.S. state of New York. With 2,736,074 residents as of the 2020 United States census, Kings County is the most populous of the five boroughs of New York City and the most populous county in the State of New York. The population density of Brooklyn was 37,339.9 inhabitants per square mile (14,417.0/km2) in 2022, making it the second-most-densely-populated county in the United States, behind Manhattan, and it had the ninth-highest population of any county nationwide. Were Brooklyn still an independent city, it would be the fourth most populous in the U.S. after the rest of New York City, Los Angeles, and Chicago.