Maritime Celestial Logarithm Tables Mastery

Maritime Celestial Logarithm Tables Mastery: Two exercises of the calculated altitude (Hc) of the sun with logarithm tables and solution.

The five tables:

The five tables for download

This section serves as an additional feature on my website, and it’s crucial to highlight that I don’t endorse starting with this particular method.

Here, I introduce a well-established celestial navigation technique that involves utilizing logarithm tables.

To initiate from the start, it is crucial to begin with the La Rochelle exercise, which includes all the fundamental concepts.

Celestial Logarithm Tables Mastery: SEE FIRST

the fully worked out example !

exercise 1

entries L D and P

The entries obtained in the first part of the worksheet are necessary to find the calculated altitude (Hc):

L = 19° 03′ N ( D.R. latitude)

D = 21°10′,5 S (Declination of the sun)

P = 7°21′,9 (NW) (polar angle)

(latitude North and sun in the West)

Maritime Celestial Logarithm Tables Mastery:

Step 1

To clarify see the four examples same name/not same name

First the two entries obtained from the worksheet:

L = 19° 03′ N // D = 21°10′,5 S

L =

D =

__________________

(L ±D) =

Maritime Celestial Logarithm Tables Mastery:

Step 2

Now we need the three entries obtained from the worksheet:

L = 19° 03′ N // D = 21°10′,5 S

P = 7°21′,9 (NW)

1(T 1 ) LOG COS L =

2(T 1 ) LOG COS D =

3(T 2 ) VERSINE P =

_________________________+

LOG 2nd Term =

Maritime Celestial Logarithm Tables Mastery:

Step 3

First the entries: (L±D) obtained in step 1

The entry log 2nd term obtained in step 2 is then transformed to the natural 2nd term using Table 4 (logarithms of whole numbers).

(T 3) COS (L ±D) =

(T4 ) Nat 2nd T =

__________________________⎼

SIN Hc =

Here an example of Table 4 (logarithms of whole numbers) to transform log 2nd T to Nat 2nd T

Step 4

the entry sin Hc obtained in step 3

(T 5) Hc =

Maritime Celestial Logarithm Tables Mastery:

The second exercise

entries L D and P

L = 31° 29′,5 N

D = 23° 18′,1 N

P = 32° 23′,8 NE

step 1

Here the two entries obtained from the worksheet:

L = 31° 29′,5 N; D = 23° 18′,1 N

L =

D =

__________________

(L ±D) =

In addition 4 examples same name/not same name

Maritime Celestial Logarithm Tables Mastery

Step 2

First the three entries obtained from the worksheet:

L = 31° 29′,5 N D = 23° 18′,1 N

P = 32° 23′,8 NE

1(T 1 ) LOG COS L =

2(T 1 ) LOG COS D =

3(T 2 ) LOG VERSINE P =

__________________________+

LOG 2nd Term =

Celestial Logarithm Tables Mastery:

Step 3

First the entries: (L±D) obtained in step 1

The entry log 2nd term obtained in step 2 is then transformed to the natural 2nd term using Table 4 (logarithms of whole numbers).

(T 3) COS (L ± D) =

(T4 ) Nat 2nd T =

__________________________−

SIN Hc =

Here an example of Table 4 to transform log 2nd T to Nat 2nd T

Step 4

the entry sin Hc obtained in step 3

(T 5) Hc =

Maritime Celestial Logarithm Tables Mastery: short summary

In this course, you will find a total of four exercises from the logarithm tables, with the necessary pages of the tables and solution included. .

Once you have gone through them and become familiar with them, you can test your skills on the seven remaining exercises. You need to purchase the PDF answer files in the store and they come with the full download version of the tables.

I printed these tables along with the azimuth tables, using only one XL cartridge, or you can check with your local printing house.This is an exceptional tool, but you need to be very organized.