Year: 1793, 1799, 1807 Language: English Author: John Hamilton Moore Format: PDF Quality: Scanned pages Pages count: 1754 Description: Between 1799 and 1802, Nathaniel Bowditch worked on a corrected and expanded version of The Practical Navigator, which was originally written by the British author John Hamilton Moore. Bowditch discovered that Moore’s work contained thousands of errors — it is sometimes said that he found more than 8,000 of them. For his first work (1802), Bowditch most likely used Moore’s 1799 edition. There are also editions from 1793, which is the oldest version available in digital form, and from 1807, which was the last edition published during Moore’s lifetime. The errors in these editions were not corrected, as Moore had no contact with Bowditch’s work. Bowditch took Moore’s work as a foundation, but his upgrade was truly thorough and revolutionary for navigation. Here are the main highlights: 1. Error correction - Moore’s tables and calculations contained thousands of errors (sometimes cited as over 8,000). - Bowditch checked every table and recalculated them, making the work reliable for navigation at sea. - Corrections included: lunar distances, solar declinations, azimuth calculations, and logarithms. 2. Addition of explanations and methods - Moore’s book was mainly tabular, with little explanation of how results were obtained. - Bowditch added clear instructions and methods: - How to measure lunar distances. - How to use the tables to determine latitude and longitude. - Practical calculation examples for sailors. 3. Adaptation for the American maritime context - Moore was British; his works used British units and conventions. - Bowditch adapted the work for American use, adding American units and standards. 4. Expansion and enhancement of content - He added new tables, instrument descriptions, and methods for navigation at sea that Moore did not cover. - The book became not just a collection of tables, but a practical manual for mariners. 5. Enduring impact - Bowditch’s 1802 edition quickly became the standard for the U.S. Navy and commercial shipping. - Moore’s works lost practical relevance afterward, as they remained full of errors and lacked Bowditch’s methods. This torrent contains all three editions.
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The New Practical Navigator
Language: English
Author: John Hamilton Moore
Format: PDF
Quality: Scanned pages
Pages count: 1754
Description: Between 1799 and 1802, Nathaniel Bowditch worked on a corrected and expanded version of The Practical Navigator, which was originally written by the British author John Hamilton Moore. Bowditch discovered that Moore’s work contained thousands of errors — it is sometimes said that he found more than 8,000 of them.
For his first work (1802), Bowditch most likely used Moore’s 1799 edition. There are also editions from 1793, which is the oldest version available in digital form, and from 1807, which was the last edition published during Moore’s lifetime. The errors in these editions were not corrected, as Moore had no contact with Bowditch’s work.
Bowditch took Moore’s work as a foundation, but his upgrade was truly thorough and revolutionary for navigation. Here are the main highlights:
1. Error correction
- Moore’s tables and calculations contained thousands of errors (sometimes cited as over 8,000).
- Bowditch checked every table and recalculated them, making the work reliable for navigation at sea.
- Corrections included: lunar distances, solar declinations, azimuth calculations, and logarithms.
2. Addition of explanations and methods
- Moore’s book was mainly tabular, with little explanation of how results were obtained.
- Bowditch added clear instructions and methods:
- How to measure lunar distances.
- How to use the tables to determine latitude and longitude.
- Practical calculation examples for sailors.
3. Adaptation for the American maritime context
- Moore was British; his works used British units and conventions.
- Bowditch adapted the work for American use, adding American units and standards.
4. Expansion and enhancement of content
- He added new tables, instrument descriptions, and methods for navigation at sea that Moore did not cover.
- The book became not just a collection of tables, but a practical manual for mariners.
5. Enduring impact
- Bowditch’s 1802 edition quickly became the standard for the U.S. Navy and commercial shipping.
- Moore’s works lost practical relevance afterward, as they remained full of errors and lacked Bowditch’s methods.
This torrent contains all three editions.
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