I already admire this man way above most humans, but this short video reveals him to be a genius. Thank you Beppe and most of all thank you yet again Sven!!
man, Sven, it is true, wisdom does come with age. I love your daily posts. I'm in South Africa - 550 km from the nearest coast. however, the way you live your life is inspirational!!! good on you
Apparently it is simple to operate but nobody had thought of inventing it until the great Sven Yrvind, the genius, did it... I like the video editing. Thank you!
As I understand it, they were using calcium citrate (calcite) crystals to be able to see the sun when it was cloudy but looking through it and being able to see the angle of the sun depending on the internal refraction. Sadly I haven't tried it, has anyone?
@@johnnyT428 as far as I understand, it could have worked with birefringence (=Doppelbrechung), i.e. by splitting the sunlight into two different, polarized beams (because the calcite has different refractive indices for the different polarisations). By orienting the stone's optical axis along incident light you can get rid of the effect. Therefore you obtain the angle of incidence. But maybe I am full of sh*. I am happy to be corrected.
Sven i was thinking about making one of these but instead of calibrating against the horizon (im far from the sea) use an “artificial horizon” as you would use with a sextant + known position and time and divide the angle by 2. Might even be a bit more precise than using a true horizon. What do you think about this? Is it feasible or looking at the artificial horizon through the bris is too bright and dangeous?
Always use a good shade. There are welding glass. Never look at the sun always at the horizon. The suns reflection in a lake or something will do I do not remember but you get twice the value or is it half you have to find the proper correction.
@@SvenYrvindExlex Yes welding glass shade is easy to find. The angle you get with artificial horizon is 2xhs so we have to divide by 2. Horizon dip does not apply as you get a virtual horizon when the angle is divided by 2. Index correction is applied before dividing and the altitude corrections also apply (refraction and parallax) but all that gets absorbed by the calibration on the Bris. Still the angles between the glasses might need to be adjusted to be able to look “down” below the horizon to 2x hs. Ill have to experiment a bit. Thanks sven! Have a good weekend.
@@tasheido Bris sextant is unique. There is no index error. In fact no error at all. Reason is, you calibrate the instrument then you calibrate it with all the errors then you can forget about them. If you calibrate from the same hight as you are going to use it you can also forget about dip error.
Calibrated angle is key. So instead of the sun angle being the variable and time fixed, as in traditional sextant, in your case the sun angle is fixed and time is the variable. Good thinking. But since time=money, your sextant seems to be expensive to use 🤣
My sextant works on doubble and quadrapel reflections. Thats why you can determine the angle to 1/100 of degree perecise. When the boat is rolling you gain what you lose in the other mirror. The angle is not affected by the boats rolling.
Because I have only a few left. That price was 10 years ago, now its 1000 € they are mainly intended for my friends. and I like to focus on the boat. But if there is a millionare he can get one.
I've never seen him have a sit down talk like this I like it a lot ❤
I already admire this man way above most humans, but this short video reveals him to be a genius. Thank you Beppe and most of all thank you yet again Sven!!
man, Sven, it is true, wisdom does come with age. I love your daily posts. I'm in South Africa - 550 km from the nearest coast. however, the way you live your life is inspirational!!! good on you
Apparently it is simple to operate but nobody had thought of inventing it until the great Sven Yrvind, the genius, did it... I like the video editing. Thank you!
This brilliant design of his has been around a long time. I'm happy to see it get described and presented properly. Best wishes from Tacoma Washington
That is my Thanks Giving gift from Sven. Thank you; I did not know such existed.
Thank you Sven for explaining this little instrument of genius design. Have a goo weekend.
You are a GENIUS!!!!!! Very ,very impressed.
Truly amazing
You missed your calling Sven, you should have have been a teacher ! Bravo Sven.... Thank you....hope to meet you some day !
That will be in my navigation set, very soon. Thanks
Congratulations for reaching one million views.
Amazing
Simply brilliant!!
Great tip from Professor & Captain Sven !!
Flink du Sven.. Snakker rolig og forståelig.
So simple, so clever.
👍👍👍👍👍good idea...
Happy Thanksgiving 🦃
Verry cool invention
This man is priceless!
amazing stuff.
Brilliant!
Eres un crack ❤
Hi Sven you are most impressive Hornblower would be proud of you
do you think the Viking sunstones of legend worked in similar fashion?
No the idea behind this instrument is as described in the video the double and quadrupple refelction nothing to do with the mythical sunstones
As I understand it, they were using calcium citrate (calcite) crystals to be able to see the sun when it was cloudy but looking through it and being able to see the angle of the sun depending on the internal refraction. Sadly I haven't tried it, has anyone?
@@johnnyT428 as far as I understand, it could have worked with birefringence (=Doppelbrechung), i.e. by splitting the sunlight into two different, polarized beams (because the calcite has different refractive indices for the different polarisations).
By orienting the stone's optical axis along incident light you can get rid of the effect.
Therefore you obtain the angle of incidence.
But maybe I am full of sh*. I am happy to be corrected.
Great! Any chance I can order one?
😁👍
Hello, on the website you have 1000 euros, in the video it is 200 euros. What sextant price is right?
👍!!!
Where can bo bought?
where do you get one?
💙💙💙💙💙💙💙💙
Sven i was thinking about making one of these but instead of calibrating against the horizon (im far from the sea) use an “artificial horizon” as you would use with a sextant + known position and time and divide the angle by 2. Might even be a bit more precise than using a true horizon. What do you think about this? Is it feasible or looking at the artificial horizon through the bris is too bright and dangeous?
Always use a good shade. There are welding glass. Never look at the sun always at the horizon. The suns reflection in a lake or something will do I do not remember but you get twice the value or is it half you have to find the proper correction.
@@SvenYrvindExlex Yes welding glass shade is easy to find. The angle you get with artificial horizon is 2xhs so we have to divide by 2. Horizon dip does not apply as you get a virtual horizon when the angle is divided by 2. Index correction is applied before dividing and the altitude corrections also apply (refraction and parallax) but all that gets absorbed by the calibration on the Bris. Still the angles between the glasses might need to be adjusted to be able to look “down” below the horizon to 2x hs. Ill have to experiment a bit. Thanks sven! Have a good weekend.
@@tasheido Bris sextant is unique. There is no index error. In fact no error at all. Reason is, you calibrate the instrument then you calibrate it with all the errors then you can forget about them. If you calibrate from the same hight as you are going to use it you can also forget about dip error.
Herregud vad lik han är Bertil från "Skrotnisse"
Sven är jorden rund eller platt? :)
Calibrated angle is key. So instead of the sun angle being the variable and time fixed, as in traditional sextant, in your case the sun angle is fixed and time is the variable. Good thinking. But since time=money, your sextant seems to be expensive to use 🤣
In the same way as you can calculate the time of the noon height you can calculate the time of the angles in the Bris sextant and waste no time.
On a small boat you have lots of time.
Sun has 9 year cycle, it moves up/down
As the old saying goes he's probably forgotten more stuff than I'll ever know
What I don't know could fill a book!
Hi friend 👋
Every ship should have one instead of relying 100% on an eclectic array of satellites and their associated systems.
Sven ,what is the difference between your sextant and a sun stone?
My sextant works on doubble and quadrapel reflections. Thats why you can determine the angle to 1/100 of degree perecise. When the boat is rolling you gain what you lose in the other mirror. The angle is not affected by the boats rolling.
@@SvenYrvindExlex thanks for responding to my question.
Why so expensive?
Because I have only a few left. That price was 10 years ago, now its 1000 € they are mainly intended for my friends. and I like to focus on the boat. But if there is a millionare he can get one.
Makes me think of something Elon Musk said; 'the best part is no part'