Just for completeness a sextant can be used for the following as well - a vertical sextant site ie if you know how high an object such as a lighthouse and you know the bearing of the object then you can a. Use mathematics or tabled to work out how far you are from the object (simple Pythagoras therum)

Secondly if you have two or three fixed objects on shore and you know the distance between then if measure the angle and plot it you can then deduce your position - this is called a horizontal sextant angle.

I really like the questions you ask about navigation. I remember a lot about surveying and navigation in general. My problem is the specific terms and words.

Very well done Alessandro

Let's try the second part.

1. I could tell you the latitude by measuring the angle between the sun or a star and the horizon.

2. From the internet. Index error refers to the difference between the actual angle measured by a sextant and the angle indicated by the instrument's arc and micrometer. This is a calibration error that must be accounted for to ensure accurate measurements.

3. Bearings can be taken of a specific point (i.e., a known object) at two or more different times, with the vessel moving between each bearing. By plotting the bearings and accounting for the vessel's motion, a correction can be obtained.

4. Internet for the correct English phrase, but I had already heard and read about it. Southampton is subject to a phenomenon known as "double tide" due to its unique geography. This results in a complex tidal pattern with two high and two low tide phases, each with different heights.

5. Elementary school notion.
During neap tides, the sun and moon are aligned at a 90-degree angle, thus "subtracting" their gravitational forces. The tidal range is smaller.(Quarter moon).
During spring tides, however, the sun and moon are aligned so that their gravitational forces are added together. Maximum range.(Full moon or new moon).

If you knew the answer it would only take 2 mins to type the answers in

Pat, that was not a question, that was an exam.🤣

A 'taste' of Last of the Summer Wine (re Norah and Compo &Co).

😎

https://www.google.com/search?client=firefox-b-d&sa=X&sca_esv=21b8fdcecfe5527b&q

https://www.google.com/search?client=firefox-b-d&sa=X&sca_esv=21b8fdcecfe5527b&q

Thank you for the words of advise - I guess I do get carried away - keep the humour coming it lightens the whole board up 🤣🤣🤣
Guess yo have to be a fan of British comedy to know who Nora Batty and Compo are

I will give the questions a rest for a week or two - just to let people get over the shell shock !

BTW Pat,
I think you drew the bow a bit too far this time, which is why no one took part.
Two part (or 3 at a pinch) questions are OK. But 13 ....!🤔
You put two weeks worth of questions into one day🤕
Don't over do it or it's not fun anymore.
Cheers, Doug😎

Pat,
'Baggywrinkles' are of course Norah Batty's wrinkly stockings, which used to drive old Compo into ecstasy 😁

😎