I was a Navigator (Quartermaster) in the US Navy and we still train to shoot star/sun lines with sextants and use stars for navigation. One time, during deployment in 2010, we lost all power in the middle of the Indian Ocean for 3 days. During that time we calculated our position, speed, drift and heading using the stars and were accurate to within 10 yards of our actual position (we checked once the power came back up) so navigating by the stars still works as long as you have the right equipment and knowledge.
@@mehere8038 There are 57 stars that are used for nautical/aeronautical navigation purposes. Polaris (the North Star) is one of the brightest in the Northern Hemisphere and it's position is relatively unchanging (it tends to hover over the North Pole year-round) which is why it has been used for navigation since the first mariners learned to use the stars. But, in the Southern Hemisphere the constellation Crux (or the Southern Cross) is used for a lot of the same reasons, there are two stars in the Southern Cross (Acrux and Gacrux) that can be used to draw a straight line through the South Pole. In celestial navigation you use the positions of three separate stars in the sky to triangulate a spot on Earth, by knowing your relative position to each of the stars and using a nautical almanac (basically a book that shows what the positions of celestial objects during the year are) a decent navigator can calculate their position fairly accurately.
My grandfather was a B-52 Navigator and taught me how to use a Sextant. I don't remember how anymore haha. I can only imagine trying to shoot stars in turbulence.
Thank you for your Service, for the Sacrifices only you know, & for this truly interesting comment!!! It’s truly remarkable that y’all were sooo close to the electronic calculation, & I have to wonder if you were actually the Correct one, as we’ve All seen that electronic intelligence, Isn’t always correct!!! I’ve Always believed that One should Never stop learning, & I’m known to verbally announce when I’ve learned something in a day! It’s something I started doing to demonstrate to my children, that I Didn’t/Don’t know Everything like they tend to believe, & to also show them that learning comes in Many forms, in Any situation, isn’t Just something that ends in school, & have since heard them doing the Same as Adults!!! I came to this video in Hopes of seeing a Beautiful brass instrument I’ve just come across, that’s being called a “Moon Compass”. I’m old now, but my youngest still always refers to the moon as”My Moon”, & was hoping it would be a nice thing for her to have, for thinking about “locating me”, when my time has ended here.
Thanks for doing the animations for the show! I guess you must do them in your sleep, so you don't even know you're animating for the show. Or even an animator to begin with!
I once heard that Arab explorers were great at navigating because they were used to navigating deserts (oceans of sand that also lack landmarks and show stars), which is a similar scenario to oceans of water.
While I can't say there's no truth to that, the arab world was, for a time, a center for learning and innovation. They were inventing algebra and the 0 with only Byzantium (who was mostly working off of old Roman knowledge), and China really doing solid academic work besides them. Combine this with the amount of trade flowing through the middle east, and navigation inventions would be expected.
Sandcastle • We call them "Arabic Numerals" and often falsely attribute 0 to them not because they invented them, but because during their Golden Age of science, they made them widespread enough for them to reach Europe. Also, "Algorithm" comes from an Arabic word, and most of the stars have Arabic names because of this period. Neil deGrasse Tyson gave a great talk on the subject. Oh, and base 60 was the Babylonians
Everything that is based on the Sun works exactly the same. If you need to use stars, then 1), there is Sigma Octantis, but it's barely visible. If you are able to see it, it works just the same as Polaris. or 2) you can also fiddle with imaginary lines based on the Southern Cross to approximate the celestial pole. Or you can just use the compass ;-)
@@daemonicanfamilyschannelof9253 3 actually, Australia, New Zealand, and Brazil Edit: Its actually 5, as Samoa and Papua New Guinea also use it on their flags
Some viking families had crystals that were natural polaroid lenses that turned dark when held up to the sun even when it was cloudy out. This allowed them to navigate quite brilliantly for the times. The stones were usually kept a secret and passed down from generation to generation.
Hi there, SciShow! I would love for people to learn about the terrifying and sudden nature of cerebral aneurysms! I had one rupture at 19 and I think it would make for an interesting video topic!
phantasm1234 maybe if you gave them some money or if one of the patrons of this show decided to ask for you? i have seen you ask a lot. now im curious about it too
A lot of Pacific and Oceanic imagery features a constelation called the Southern Cross and the Two Pointers (all of our flags for example) The Southern Cross is a diamond shaped formation that can be used to navigate because they are laid out in a similar fashion to the compass (though, of course it's use pre-dates physical compasses).
not really like a compass layout. To navigate with the Southern Cross, you draw an imaginary line from the top star to teh bottom & continue down towards the horizon. You draw a second imaginary line through the middle of the pointers, travelling at right angles to them, again downwards. Where those 2 imaginary lines meet, follow it straight down to the horizon & that's south
@@mehere8038 Yes I am aware but I adapted my explanation to assume most people have no knowledge of the Southern Cross, but most people DO understand the concept of a compass.
I remember reading about sunstones, and I seem to recall that in at least one of the stories that talk about it, the sunstone *isn't even the magical thing.* Something like, there was someone looking for a really good navigator, who asked "who among you can tell me where the sun is?" on a really cloudy day. Someone pointed at a spot of sky, and the person looking said "fetch the sunstone to check if this person is right!" And the sunstone said they were, meaning they were a legendary navigator.
Wow, the kamal is the epitome of smart simplicity. It's also crazy ingenious. It's these little inventions that make me look in awe at our ancestors--there were some quite smart cookies among them!
Great Episode! Idea for a next episode: The history of sailboat rigs throughout the ages. Why they became popular and why we mostly use a sloop rig nowadays.
stick charts are so cool. Supposedly experienced Marshallese sailors could close their eyes and literally feel each of the distinct currents and the directions they were coming from as the waves hit the ship.
Before radiation belts, James Van Allen was a WWII junior officer on a destroyer testing improved proximity fuses, junior enough (and not part of ships crew) so the location somewhere in the South Pacific was secret from him. He used a protractor and plumbob to measure the sun's elevation every minute for a half hour around local noon to determine maximum elevation angle and time. By fitting the measurements to a smooth curve, he was able to determine daily location to "about a mile". Ships location was secret but GMT was not. Source: U of Iowa General Astronomy class 1970, JVA digression from whatever the main topic of the lecture was.
honestly surprised by the amount of people mad and confused about SciShow using Current Era and Before Current Era instead of Before Christ and Anno Domini. It is simply a way to state time without stating a belief in Christ. and has existed since the 1700's. The terms in no way sound less educated, except in the fact that Anno Domini sounds like a different laguage (it's medeval latin) which only makes you feel smarter. I'm glad they used CE and BCE and hope more people do the same in the future.
I was really surprised because I saw this on the show "Vikings" and I thought it was made up, like many things from popular movies are. I'm really glad to see it explained and that such a cool natural tool is actually real.
Amazing stuff. We sometimes tend to dismiss ancients as technologically backward and superstitious, but they were also very intelligent and resourceful. Those are some pretty clever and simple navigational strategies. Hats off.
"because... ofcourse they had magic stones" 😂 I'm so proud of the legacy of my ancestors 😂 I once read an article that Danish historians think Vikings could tell where they were on sea based on the marine life as well as tasting the seafloor
We all pretend that knowledge of the stars is somehow impressive the farther back you go in time. But when there is no light pollution, the stars are not a collection of billions of single points, but masses of swirling paint with fixed objects moving through it. What they did was memorize that single episode of the cartoon they watched in the sky before bed until they knew all the words and were singing along with the intro music. There was literally nothing else to do because night was a thing people suffered from.
Interesting comment, very erudite and poetic. ^_^ Reminds me of something I heard about the night sky being the television of their day, and each constellation was a story.
Always a pleasure to watch an episode of Sci-Show! Regarding possible future content, considering current U.S. government attitudes towards coal and the EPA, I would love to see Sci-Show do an episode on the pollution-weather incidents like the Great Smog of London c1952 or the 1948 Donora smog. Curious to know if such conditions could be met again if clean air laws were to be repealed versus current production technology.
I'd like to add on the first story about Oceania people. Linguists found that some tribes have an absolute terms for directions, so they don't even say left right etc.. but North and South. This ability is trained from birth and it helps to navigate world dramatically. Just try to remember what direction you're heading to without looking at any device.
been talking about this stuff for a long time, thanks so much for providing ways to source the actual information. Have you heard that similar data is encoded in the complex carvings, sometimes of intersecting snakes, on artifacts and masts, and seemingly extraneously complicated knots found in the boats and possessions of ancient scandinavian sailors?
Birds. Some sea birds range as far as 200 miles from land before returning to shore to roose, so by keeping track of sea birds, you can if there's an island nearby, even if you can't see it.
They also learned what birds could be seen at what distance from land. Say you see an albatross? Land is quite possibly quite some distance away, although you know there is land "nearby". Say you see an eagle? You should probably make sure to keep at least four eyes constant on the horizon and not sail at night, least you run aground. So yes, they did use birds to navigate.
These all help with latitude. How about an episode on the struggle to figure out longitude. A great book, Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time, is a great read for anyone interested.
Martin Green As a professional merchant mariner, I can tell you that a sextant is simply a later adaptation of an astrolabe for measuring angles. Only, you actually have to visibly see the horizon. It’s not as interesting as a sunstone or groundbreaking as the magnetic compass.
With your arm outstretched, count how many fists you can lay on top of each other between the horizon and Polaris (which you can find by following the big dipper/plow), each fist is roughly 10 degrees of latitude. No need to waste your time making these fancy string and block of wood contraptions. You can also identify East by tracing the path of the first star to rise of Orion's belt, it rises within 1 degree of East unlike the sun which can be off by a fair margin depending on season.
Calling a small wooden board with a string attached "fancy contraption" does stretch the term a bit. Unless you think hand-axes are marvels of technology. :D
Getting lost is super easy where I live. Too many trees and mountains. Good luck finding cell service! And we have zero places with free wifi in my county. Plus GPS is incredibly unhelpful even when you do have service. We have dozens of truckers that get sent down the shortest path to the interstate, but GPS doesn't tell them that the one lane tunnel is only 9 feet tall. They have to back up for a couple of miles before they can even turn around, unless they cut into people's yards.
Was I the only one that had to look up CE? Why use CE when AD has been the convention for so long? Maybe they teach CE in schools now? Thanks for the video, and the opportunity to learn an additional fact:)
Combining it with the compass and a latitude-finding device like a kamal, cross-staff or sextant gives you a pretty accurate way to find out exactly where you are.
You missing out the most genious tool - the clock! for longitudes! The museum at Greenwich has the whole story of why a clock that works on sea is so useful yet hard to design, but then people made it!
The vikings also used a solar compass. A disk with a cone in the middle. Using the direction of the shadow the cone casts , you can find North. Using the length of the shadow at noon , you can work out the latitude.
I know I might get a bit of criticism for posting this here, but the crows nest on ships is further proof that early mariners believed the earth to be curved and spherical. if the world is flat, seeing across the great distances of an ocean free of obstructions would be easy to achieve. You wouldn't need a tall vantage point, just look through your telescope and voila! But the crow's nest was designed to see as far beyond the earth's curvature as possible.
Australian Aboriginal cultures used the stars as maps. They found star combinations that could be told into a story, showing directions to travel to get from place to place. Many Australian roads today actually look like various constellations if you copy just their intersections onto a piece of paper, cause the roads were built along existing Aboriginal tracks that were using star maps to navigate the land
Imagine being a person all those years ago and seeing things like magnets and sunstones do their work. There's no way you wouldn't see that and consider it some kind of magic. Hell, even people nowadays are writing songs with lyrics "F***ing magnets! How do they work??"
And the basis of GPS! Each GPS satellite is a flying chronometer which broadcasts the time of day and it's own position. By comparing 3 signals, a ship can calculate her own position. Airplanes and landcrabs need a 4th signal to correct for not being at sea level.
I always did wonder if any civilisation used the way the oceans feel to navigate but then i shrugged it off thinking you would need to be really amazing to pick up the feeling of currents and such on boats, then watching this It makes sense to do so if your in a canoe a small vessel that is going to feel those difference's clearly, so yeah thats pretty amazing.
They bring this up in an episode of QI, apparently some navigators would get into the water and use their breasts/scrotum to feel the movement of the water.
Sorry if my question is a little bit funny, im just curious, Let say that we can freeze every particle in the whole univerese on its potition, how long is the gap beetween "one frame" to the next "frame"?. What i mean by "frame" is the arangement of all particle at one point in time.
