Francis Gladheim Pease (1881–February 7, 1938) was an American astronomer. 1881 was a common year starting on Saturday (see link for calendar). ... 1938 (MCMXXXVIII) was a common year starting on Saturday (link will take you to calendar). ... An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ...

He joined the Yerkes Observatory in Wisconsin, where he was an observer and an optician. There he assisted George W. Ritchey who built many of America's first large reflecting telescopes. In 1908 he became an instrument maker at the Mount Wilson Observatory. Among his designs was the 100-inch telescope at that observatory, and a 50-foot interferometer that he used to measure star diameters. The 102 cm (40 inch) refractor at the Yerkes Observatory. ... State nickname: Badger State Official languages None Capital Madison Largest city Milwaukee Governor Jim Doyle (D) Senators Herb Kohl (D) Russ Feingold (D) Area  - Total  - % water Ranked 23rd 169,790 km² 17 Population  - Total (2000)  - Density Ranked 18th 5,453,896 38. ... Ritchey 24 reflecting Telescope George Willis Ritchey (December 31, 1864 – November 4, 1945) was an American optician and telescope maker and astronomer (educated as a furniture maker) born at Tuppers Plains, Ohio. ... Ritchey 24 reflecting telescope A reflecting telescope (reflector) is an optical telescope which uses mirrors to reflect light, rather than lenses to pass light. ... 1908 (MCMVIII) is a leap year starting on Wednesday (link will take you to calendar). ... The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California. ... Interferometry is the applied science of combining two or more input points of a particular data type, such as optical measurements, to form a greater picture based on the combination of the two sources. ...

He was a long time assistant to Albert A. Michelson. In 1920, Michelson and Pease were able to use a stellar interferometer fitted to the 100-inch telescope at Mt. Wilson to measure the angular diameter of the star Betelgeuse. Their estimate of 0.047" was very close to the value that Eddington had predicted. Albert Abraham Michelson. ... 1920 (MCMXX) is a leap year starting on Thursday (link will take you to calendar) // Events January January 7 - Forces of Russian White admiral Kolchak surrender in Krasnoyarsk. ... Hubble UV picture of Betelgeuse. ... One of Sir Arthur Stanley Eddingtons papers announced Einsteins theory of general relativity to the English-speaking world. ...

He would later be involved in the design of the 200-inch Hale Telescope at the Mount Palomar Observatory. In 1928 he made the first discovery of a planetary nebula within a globular cluster (M15). The Hale Telescope is the largest telescope at the Palomar Observatory. ... Palomar Observatory is a privately-owned observatory located in San Diego County, California, 90 miles (145 km) southeast of Mount Wilson Observatory, on Palomar Mountain. ... 1928 (MCMXXVIII) was a leap year starting on Sunday (link will take you to calendar). ... NGC 6543, the Cats Eye Nebula A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. ... A globular cluster is a spherical bundle of stars (star cluster) that orbits a galaxy as a satellite. ... Globular Cluster M15 (also known as Messier Object 15, Messier 15, M15, or NGC 7078) is a globular cluster in the Pegasus constellation. ...

Pease crater on the Moon is named after him. Crust composition Oxygen 43% Silicon 21% Aluminium 10% Calcium 9% Iron 9% Magnesium 5% Titanium 2% Nickel 0. ...

See also

• History of astronomical interferometry