| 1. | He became superintendent of HM Nautical Almanac Office from 1891 to 1910.
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| 2. | He was promoted to Superintendent of the Nautical Almanac Office in 1930.
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| 3. | Lewis began work as a computer at the Nautical Almanac Office in 1908.
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| 4. | During the 1829-31 period, he briefly served as Superintendent of the Nautical Almanac.
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| 5. | From 1831 until his death he was Superintendent of HM Nautical Almanac Office.
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| 6. | His father worked as a computer for The Nautical Almanac in Truro, Cornwall.
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| 7. | From 1832, responsibility for publication was transferred to Her Majesty's Nautical Almanac Office.
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| 8. | He took on overall responsibility for the Nautical Almanac Office.
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| 9. | He moved to Nautical Almanac Office in Cambridge, Massachusetts.
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| 10. | The British Nautical Almanac published lunar distance tables until 1906 and the instructions until 1924.
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