Paper, 'On the discordances between the sun's observed and computed right ascensions as determined at the Blackman Street Observatory, in the years 1821 and 1822; experiments to shew that they do not originate in instrumental derangement; also a description of a seven-feet transit with which the observations were procured, and upon which the experiments were made' by James South
Reference number: PT/18/14
Date: 01 June 1826

Description
Illustrations for this paper have been separated from the manuscript and are found at PT/73/12/16.
Subject: Astronomy
Published in volume 116 of Philosophical Transactions as 'On the discordances between the sun's observed and computed right ascensions, as determined at the Blackman-street observatory, in the years 1821 and 1822; with experiments to show that they did not originate in instrumental derangement. also a description of the seven-feet transit with which the observations were procured, and upon which the experiments were made'.
Read 8 June 1826.
Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 2, 1833.
- Reference number
- PT/18/14
- Earliest possible date
- 01 June 1826
- Physical description
- Ink on paper
- Page extent
- 19 pages
- Format
- Manuscript
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James South, Paper, 'On the discordances between the sun's observed and computed right ascensions as determined at the Blackman Street Observatory, in the years 1821 and 1822; experiments to shew that they do not originate in instrumental derangement; also a description of a seven-feet transit with which the observations were procured, and upon which the experiments were made' by James South, 01 June 1826, PT/18/14, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/pt_18_14/paper-on-the-discordances-between-the-suns-observed-and-computed-right-ascensions-as-determined-at-the-blackman-street-observatory-in-the-years-1821-and-1822-experiments-to-shew-that-they-do-not-originate-in-instrumental-derangement-also-a-description-of-a-seven-feet-transit-with-which-the-observations-were-procured-and-upon-which-the-experiments-were-made-by-james-south, accessed on 21 April 2025
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Related Publications
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On the discordances between the sun’s observed and computed right ascensions, as determined at the blackman-street observatory, in the years 1821 and 1822; with experiments to show that they did not originate in instrumental derangement. Also a description of the seven-feet transit with which the observations were procured, and upon which the experiments were made External link, opens in new tab.
Date: 31st December 1833
DOI: 10.1098/rspl.1815.0300
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XXVIII. On the discordances between the sun's observed and computed right ascensions, as determined at the Blackman-street Observatory, in the years 1821 and 1822; with experiments to show that they did not originate in instrumental derangement. Also a description of the seven-feet transit with which the observations were procured, and upon which the experiments were made External link, opens in new tab.
Author: James South
Date: 31st December 1826
DOI: 10.1098/rstl.1826.0032
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Drawings, sections through axis and telescope by [T Bradley]
Creator: James South Reference number: PT/73/12/16
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Manuscripts of papers published in Philosophical Transactions, 1825-1828
January 1825 - December 1828 Reference number: PT/18
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James South
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Philosophical Transactions
The 'Philosophical Transactions' collection comprises manuscript versions of papers published in The Philosophical Transactions of the Royal Society, the world’s first and longest continuously running journal dedicated to science.
Dates: 1802 - 1865
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