Trundle town! Measuring physical surface distance of one arcminute of longitude at 48 North
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- čas přidán 4. 07. 2024
- ALSO SEE: Done in Australia, 34 Degrees South! • Taking you all down to...
Here is the raw uncut footage from the GoPro camera on the trundle wheel: • Raw footage - Trundle ...
Also, here is my previous similar measurements: • Measuring the physical... - Věda a technologie
WELCOME TO TRUNDLE TOWN!!!
Thank you thank you and thank you! And thank you for your excellent measurement and video in Australia! czcams.com/video/-g-437wi9Ds/video.html
If I can get hold of a trundler, I'll trundle at 38°13'44.67"S, 144° 6'33.35"E.
@@billybowden7079 Woah that is a great E-W line, but it looks like a railroad track -- is there a smooth surface to roll the trundle on? Or would you have to modify the wheel to go on a train track? Also, watch out for trains!
@@fromjesse Ha! I didn't check the terrain, just saw the line on Google Maps. If that's the train tracks to Warrnambool, I don't think I want to mess with the freight trains on that line! I'll scope it out this week.
Trundle Town is one of the better towns.
Try measuring both a minute of Longitude and Latitude at one of those road intersections from the same point in the shape of an ' L '. You'll discover they're different and that's because the earth is an ellipsoid, not a circular round ball.
@@JesseKozlowski That's not why you'd measure a difference, even on a perfect sphere one minute of longitude will be shorter than one minute of latitude everywhere except on the equator
@@giovanirubim2758 , oh duh but of course!!! Duh. You are absolutely correct. I would have appeared to be more on the ball if I said something smarter such as, naturally the distances between lines of Longitude will be shorter than between lines of latitude, but, you should also be able to detect that the shape is not a perfect circular ball, rather a slightly squashed at the poles ellipsoid shape. There, how's that? Thanks for correcting me :-)
For fun here is my maths: 48.1 N on flat Earth = 48.1 x 60 NM = 2886 NM from the North pole. 1 arc minute around the line of latitude is 2886 NM x 2 x Pi / (360 x 60) = 0.8395 NM or 1554 meters. On a sphere of radius 6371 km the radius at 48.1 N is 6371 km x Cosine(48.1) = 4254.76 km. 1 arc minute around the line of latitude is 4254.76 km x 2 x Pi / (360 x 60) = 1.238 km or 0.6683 NM. The Earth is an oblate spheroid rather than a sphere so a spherical calculation is a bit out, but is still way closer than the stretched out Azimuthal Equidistant projection used as a flat Earth map.
Perhaps if I use 60 NM per degree at the Equator: radius = 60 NM x 360 / (2 x Pi) = 3438 NM. Radius at latitude 48.1 = 3438 NM x (90 - 48.1) / 90 = 1600.58 NM. 1 arc minute around the line of latitude is 1600.58 NM x 2 x Pi / (360 x 60) = 0.4656 NM or 862 meters. Nope still way out.
Indeed! It sure matches a globe closer than it does a flat surface, doesn't it!
Теперь осталось повторить этот эксперемент в Автралии или ЮАР :)
Check the description! It's already been done in Australia at around 34 degrees South! And we got a guy working to do it also at 26 degrees South as well!
I love that you do this it's so funny
Thanks! After hearing my speech, what would you say is the one thing I should work on to be more clear and easier to listen to? Slow down? Enunciate more clearly? More/less inflection? Etc? Thanks!
@@fromjesse I think you speak really well, you're very easy to understand, clear, precise, nice pace. All I think about this video, for future ones, is maybe give a quick easy-to-follow explanation for some things that are taken as granted knowldege, eg what a minute of longitude is for laypeople.
@@HarryKey Good idea! Thanks!
Where's the background indian song?
Didn't need one :D
Are you claiming an arc min.at higher latitudes is smaller than an arc minute at the equator on a sphere?If yes I would love to see your radius animated.And I would trust total station more than wheel or Google Earth
Yes, the physical surface distance between lines of longitude is greatest at the equator, and less the farther you get from the equator -- converging both going southward and going northward of the equator.
Yes that’s how spheres work!
I agree, the total station Electronic Distance Measurement is most likely the most accurate of the methods I used. The GPS is just a consumer grade GPS and is likely to have a meter of error and finding exact sub-meter accurate spots on google earth is tricky. And yeah the trundle wheel bounces along and isn't perfectly exact. But it's also strictly physical, so that's why it's important for those people who don't understand how a laser range finder works.
I'm not sure what you mean when you mention seeing a radius animated.
Do you understand that lines of longitude are fixed physical locations on earth? And that we can measure the distance between them using purely physical methods?
@@fromjesselongitude is a concept, dude. All you have is a physical area upon which to overlay this concept. It’s not reality. Your E/W longitude am bs isn’t reality; it’s just a concept.
@@theplanetruth Would you be willing to discuss this with me on your show or on Jeran's show if he's willing?
Nice measurements 🧮👍, but what does the measurements have to do with the shape of the Earth? 🌎 🦧 Longitude and Latitude are just reference points in a grid, that are used for Navigation and mapping. I think globe was just accepted as a universal mapping for sailing, same as 360° for the circle ⭕. Doesn't mean that is the actual shape of the Earth 😅 just a standard unit for navigation 🧭.
Do you believe that lines of longitude are straight?
Do you believe that lines of longitude are evenly spaced?
Please answer yes or no to each, then I can answer the rest of your question.
The fact that meridians converge at two poles both North and South of the equator means that you can travel South or North along any meridian and, without turning left or right, end up on the opposite meridian, and you'll eventually end up all the way back to where your started.
Oh right, why should measurements of the size of the Earth have anything to do with the shape and size of the Earth... 😂
@@fromjesse depends what you use to read the longitude: a flat map viewed from above the North Pole 🗺️ or a curved Globe 🌍. That's exactly what I was pointing out, but you seem not to get it.
@@fromjesse longitude and latitude is just reference points to the celestial body. Meridian is set to 0° based to Greenwich, England - while Equator is probably set to Polaris 0° at horizon.