Letter, from Juan Cruzado to Henry Oldenburg

Reference number: EL/C2/2

Date: 10 December 1675

Description

Cruzado discusses points made in his letter of (EL/C2/1). These are:
- a new place for the prime meridian
- testing the equal revolution of the natural day with his pendulum clock
- ascertaining the moon's place on land and at sea
- the longitude of Seville from observations of the lunar eclipse and Tychonic tables
Read to the Royal Society on 28 October 1675
Printed in 'Philosophical Transactions', vol 10, no 118, p 429

Reference number: EL/C2/2
Earliest possible date: 10 December 1675
Page extent: 4.5 pages
Format: Manuscript
Also available on Early Modern Letters Online: View

Creator name

Juan Cruzado

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Citation

Juan Cruzado, Letter, from Juan Cruzado to Henry Oldenburg, 10 December 1675, EL/C2/2, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/el_c2_2/letter-from-juan-cruzado-to-henry-oldenburg, accessed on 21 June 2025

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https://makingscience.royalsociety.org/items/el_c2_2/letter-from-juan-cruzado-to-henry-oldenburg

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Related Publications

An extract of a letter to the publisher from a spanish professour of the mathematicks, proposing a new place for the first meridian, and pretending to evince the equality of all natural daies, as also to shew a way of knowing the true place of the moon External link, opens in new tab.

Date: 25th October 1675

DOI: 10.1098/rstl.1675.0043

Hierarchy

This item is part of:

'Early letters': letters from correspondents in natural philosophy sent to the Royal Society and its Fellows
1613-1740 Reference number: EL
Early Letters C2
1675-1736 Reference number: EL/C2

Related Fellows

Henry Oldenburg
Recipient

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Early Letters

The archival collection known as 'Early Letters' is composed of original manuscript letters sent to, or collected by, the Royal Society from English and foreign correspondents.

Dates: 1613 - 1740

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