Marine logarithm tables of whole numbers and example of how to use them
Marine logarithm tables:
This page only explains the use of this table, but you need to go to the page ‘Sun’s altitude and logarithm tables at sea‘ to see the full context.
The best way to calculate your position at sea using a sextant and logarithm tables is to start with the exercise ‘La Rochelle.’
After the general first part, make your choice between the calculator or the logarithm method.
Table of Logarithms of whole numbers
These tables were developed by the author with the help of Google Sheets.
The five tables necessary to obtain the calculated height (Hc)
- Table 1: log cosine
- Table 2: log versine
- Table 3: natural cosine
- Table 4: logarithms of whole numbers
- Table 5: natural sine
Marine logarithm tables:
Marine logarithm tables:
example table 4: (logarithms of whole numbers)
Marine logarithm tables:
The mantissa
With the Mantissa,
we will search for the whole number
Whole number is 2354 (see below)
Table 4 page 2200/2600
The use of the characteristic is to put the coma
after finding the whole number, we have to put the comma!
Characteristic is 29 (see below for the coma)
Whole number = 2345
Characteristic = 29
natural second term = 0,2354
Marine logarithm tables: recall
The purpose is to calculate the height of the sun (Hc) without a calculator.
The use of logarithm tables will replace multiplication with addition.
We will find an example and two exercises completed in the interactive worksheet (tables) page in the calculated Height section.
The idea is to continue with the concept of the DR position, and intercept but we no longer use the rule of signs (positive or negative)
It will be replaced by the notion same name or not same name.
method:
In principle, we adhere to the same Saint-Marc-Hilaire method.
These logarithm tables do not depend on time either.