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This new distance unit is named as meridional part which is the increased length of the meridian on a Mercator chart measured from the equator to the parallel (latitude) and is expressed in minutes of the longitude scale.
So this is the formula for meridional parts: Meridional Parts = (Latitude ÷ 2) + 45 = Tan Log Ans × 7915.7 - Sin latitude × 23.2. The application for this formula will be dealt with in my next post on mercator sailing. P.S.
Meridional parts (M). The meridional parts of the point of departure are designated Ml, and of the point of arrival or the destination, M2. Meridional Parts can be found in Table 6 in Volume 2 with the latitude as an entering value. 12. Meridional difference (m). The mathematical difference between the tabular values of M2 and Ml. 13.
Calculation of the meridional parts used in the construction of Mercator charts and in Mercator sailing for each minute of latitude from the equator to the poles. Enter the latitude for which the meridional part is desired.
This page allows calculation of the meridional parts used in the construction of Mercator charts and in Mercator sailing for each minute of latitude from the equator to the poles. Enter the latitude for which the meridional part is desired.
As Professor Taylor has described, the Hariot ms. is largely concerned with the calculation of meridional parts. These calculations are of great interest not only as regards the question of priority, but also because they are based on a method which was more than fifty years in advance of contemporary mathematical knowledge.
15 paź 2020 · Meridional parts. Since the latitude and distance scale at any point on a Mercator charts is proportional to the secant of the latitude of that part, the scale continually increases as it recedes from the equator, until at the poles it becomes infinite.
