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G. B. Riccioli's 1651 Almagestum Novum contains a table of diameters of starsmeasured by Riccioli and his associates with a telescope. These telescopicallymeasured star diameters are spurious, caused by the diffraction of light wavesthrough the circular aperture of the telescope, but astronomers of the time,including Riccioli and Galileo Galilei, were unaware of this phenomenon. Theybelieved that they were seeing the physical bodies of stars. In the AlmagestumNovum Riccioli uses these telescopically measured disks to determine thephysical sizes of stars under both geocentric (or geo-heliocentric - Tychonic)and heliocentric (Copernican) hypotheses. The physical sizes obtained under theCopernican hypothesis are immense - dwarfing the Earth, the Sun, and theEarth's orbit; even exceeding the distances to the stars given by Tycho Brahe.Thus Riccioli felt that telescopic observations were an effective argumentagainst the Copernican system.

Riccioli Measures the Stars: Observations of the telescopic disks of  stars as evidence against Copernicus and Galileo in the middle of the 17th  century