Skip to content

We ask you, humbly: don't scroll away.

Hi readers, it seems you use Catholic Online a lot; that's great! It's a little awkward to ask, but we need your help. If you have already donated, we sincerely thank you. We're not salespeople, but we depend on donations averaging $14.76 and fewer than 1% of readers give. If you donate just $5.00, the price of your coffee, Catholic Online School could keep thriving. Thank you.

Help Now >

Giuseppe Campani

Free World Class Education
FREE Catholic Classes

An Italian optician and astronomer who lived in Rome during the latter half of the seventeenth century. His brother, Matteo Campani-Alimensis, and he weere experts in grinding and polishing lenses, especially those of great focal length and slight curvature. These lenses were used in long telescopes of considerable power. The astronomer Cassini made his discoveries with these lenses. Campani also made many observations himself. Cassini called his attention to the spots on Jupiter, and he disputed with Eustachio Divini, an Italian optician, the priority of their discovery. His astronomical observations and his descriptions of his telescopes are detailed in the following papers: "Ragguaglio di due nuovi osservazioni, una celeste in ordine alla stella di Saturno, e terrestre l'altra in ordine agl' instrumenti" (Rome, 1664, and again in 1665); "Lettere di G. C. al sig. Giovanni Domenico Cassini intorno alle ombre delle stelle Medicee nel volto di Giove, ed altri nuovi fenomeni celesti scoperti co' suoi occhiali" (Rome, 1666).

His brother, mentioned above, is also noted as a mechanician for his work on clocks. He was a priest in charge of a parish in Rome. Louis XIV of France ordered several long-focus lenses (86, 100, 136 feet respectively) for Cassini, who discovered with their aid additional satellites of Saturn.

To all our readers, Please don't scroll past this.

Deacon Keith Fournier Today, we humbly ask you to defend Catholic Online's independence. 98% of our readers don't give; they simply look the other way. If you donate just $5.00, or whatever you can, Catholic Online could keep thriving for years. Most people donate because Catholic Online is useful. If Catholic Online has given you $5.00 worth of knowledge this year, take a minute to donate. Show the volunteers who bring you reliable, Catholic information that their work matters. If you are one of our rare donors, you have our gratitude and we warmly thank you. Help Now >

Never Miss any Updates!

Stay up to date with the latest news, information, and special offers.

BOGO 50% off Face Mask with Cross

We ask you, humbly: don't scroll away.

Hi readers, it seems you use Catholic Online a lot; that's great! It's a little awkward to ask, but we need your help. If you have already donated, we sincerely thank you. We're not salespeople, but we depend on donations averaging $14.76 and fewer than 1% of readers give. If you donate just $5.00, the price of your coffee, Catholic Online School could keep thriving. Thank you.

Help Now >

Catholic Online Logo

Copyright 2021 Catholic Online. All materials contained on this site, whether written, audible or visual are the exclusive property of Catholic Online and are protected under U.S. and International copyright laws, © Copyright 2021 Catholic Online. Any unauthorized use, without prior written consent of Catholic Online is strictly forbidden and prohibited.

Catholic Online is a Project of Your Catholic Voice Foundation, a Not-for-Profit Corporation. Your Catholic Voice Foundation has been granted a recognition of tax exemption under Section 501(c)(3) of the Internal Revenue Code. Federal Tax Identification Number: 81-0596847. Your gift is tax-deductible as allowed by law.

Subscribe to Our Newsletter!