I would take this as a minor error of 8☂7' - the Ascendant is still Aquarius though on the correct chart the Moon just slips from the 1st into the 12th house. In London, the stated celestial degrees crossed the angles 17 minutes before Sibly's stated time of 22:10. The angular data was presumably derived from the same astronomical tables. The Angles: The Ascendant and MC are consistent.So even if Sibly had calculated using only longitude data (and disregarded clock time) as was possible at the time, the five hour time difference (which still exists today) would have applied. Longitude and Local Mean Time: Was Sibley converting longitude into local time? London is east in the GMT time zone at around 00☀8'W and Philadelphia is also east on the time zone at 75☁7'W - so the difference (75☀9' of longitude) in strict local time between the cities is 5 hours 0 minutes and 36 seconds.So this may account why the position Mercury is four days out (8th July GMT). Though, huge advances in precision came with Isaac Newton, the orbit of Mercury, for example, was not well formulated and has been improved by discoveries such as Einstein's General Relativity in 20th century. Imprecise Calculations: The inconsistency with his calculations partly reflects the limited knowledge of the orbital elements in the late 18th century.
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