A ferry from Bornholmslinjen hiding behind the horizon, March 11th 2019 Mathias Kp 2019-03-13 | In this video I show how ships disappear bottom up behind the horizon. I didn't have a tripod with me so the footage is very unstable.Dandypanty made a stabilized version: youtube.com/watch?v=oVMxohidO40The ferry is sailing between Rønne (Denmark) and Ystad (Sweden), marinetraffic.com/en/ais/home/centerx:14.4/centery:55.2/zoom:9Ferry: marinetraffic.com/en/ais/details/ships/shipid:155510/mmsi:219017081/vessel:EXPRESS%201On a different day (19th of March) I used an app to get the position of the ferry. I made a collage with all the needed data to calculate amount obstructed here https://flic.kr/p/2dVCxfRFerry height estimated based on photographs: 24mObserver height: 4.05mDistance: 21.6kmAmount hidden geometrical on globe Earth: 16.3mAmount hidden including std. refraction on globe Earth: 12.9mAmount hidden observed: ~13.3m
Fresnel lens, function demonstrated using pen laser pointer Mathias Kp 2020-07-23 | A quick video to demonstrate how a fresnel lens works and how much it can change the path of light. In the video I used a fresnel lens sheet.en.wikipedia.org/wiki/Fresnel_lens
February 12 2019, Turning Torso 2 Mathias Kp 2020-06-27 | Some more footage from the same day youtube.com/watch?v=8TvlCSZp2aw and youtube.com/watch?v=TX7Obu1k-CgPhoto: https://flic.kr/p/2jfRMN6Air/water temperature: 2-4°C, other weather data https://flic.kr/p/S7aa6iHeight of Turning Torso: https://flic.kr/p/2f28vnTObservation point: google.com/maps/search/?api=1&query=55.713731,12.620497Camera: Canon Powershot SX60 HS, 21-1365mmObserver height: 3.7mDistance: 25km#TurningTorsoMathias
February 12 2019, Turning Torso 1 Mathias Kp 2020-06-27 | Some more footage from the same day youtube.com/watch?v=8TvlCSZp2awPhoto: https://flic.kr/p/2jfRMN6Air/water temperature: 2-4°C, other weather data https://flic.kr/p/S7aa6iHeight of Turning Torso: https://flic.kr/p/2f28vnTObservation point: google.com/maps/search/?api=1&query=55.713731,12.620497Camera: Canon Powershot SX60 HS, 21-1365mmObserver height: 3.7mDistance: 25km#TurningTorsoMathias
Black or white swan, Turning Torso seen over 21 days Mathias Kp 2020-02-28 | Over the last couple of months there have been some discussion about bmlsb69 “black swan” observation(s) youtube.com/watch?v=2e3-XVQnFzM that has a horizon far from where it would be on a globe Earth. I thought it would be interesting to go out and make the same observation over 21 days, and see if I would get obstruction or no obstruction most of the time.Observation point: google.com/maps/search/?api=1&query=55.652448,12.647530Observer height: 3.0 mTurning Torso height: https://flic.kr/p/2f28vnTDistance to small houses: 6.37 kmDistance to TT: 21.08 kmClearest day 19th February 2020: https://flic.kr/p/2jDp31PAuto level observation: https://flic.kr/p/2iW7LPEMaps: https://flic.kr/p/2icBrNd#TurningTorsoMathias
Comparison of amount obstructed and quality with different cameras and lenses Mathias Kp 2019-05-24 | A quick video to show the amount obstructed with different cameras/lenses 1365mm focal length vs 2907mm.Distance 25kmAir/water temperature: 2-4°C, other weather data https://flic.kr/p/S7aa6iHeight of Turning Torso: https://flic.kr/p/2f28vnTObservation point: google.com/maps/search/?api=1&query=55.713731,12.620497Camera 1:Lens: 21-1365mmCamera: Canon Powershot SX60 HSFocal length: 1365mmObserver height: 3.7mCamera 2:Lens: Bresser Messier MC-127 1900mmCamera: Sony NEX-6Focal length: 1900mm*1.53 = 2907mmObserver height: 3.85mPhotographs and calculations, camera 2:2019:02:12 16:01:39, day https://flic.kr/p/SFZLay and with 3D model https://flic.kr/p/2fP5whP2019:02:12 17:31:44, day/night https://flic.kr/p/24dCS5v2019:02:12 18:35:47, night https://flic.kr/p/24dCRjHObserver height: 3.85mObscured observed: 21.3mObscured on a globe Earth, geometrical: 25.42mObscured on a globe Earth, geometrical with std. 7/6 refraction: 20.45m#TurninTorsoFlatEarth
Ferry from Bornholmslinjen behind horizon, May 5th 2019 Mathias Kp 2019-05-14 | Date of footage: 13th May 2019Observer height: 4.84mObservation point: https://www.google.dk/maps/@55.10644,14.69922,19.47zFerry: marinetraffic.com/en/ais/details/ships/shipid:155510/mmsi:219017081/imo:9501590/vessel:EXPRESS_1da.wikipedia.org/wiki/Express_1The ferry is sailing between Rønne (Denmark) and Ystad (Sweden), marinetraffic.com/en/ais/home/centerx:14.4/centery:55.2/zoom:9On a different day (19th of March 2019) I used an app to get the position of the ferry. I made a collage with all the needed data to calculate amount obstructed here https://flic.kr/p/2dVCxfR I also made a stabilized timelapse youtube.com/watch?v=T3jus582qGc
Turning Torso obstruction, telescope video, 12th February 2019 Mathias Kp 2019-05-12 | Video taken from 25km of distance and 3.85m of height.Focal length: 2907mm, 1900mm telescope with a SLR camera with a crop factor of 1.53Photographs:2019:02:12 16:01:39, day https://flic.kr/p/SFZLay and with 3D model https://flic.kr/p/2fP5whP2019:02:12 17:31:44, day/night https://flic.kr/p/24dCS5v2019:02:12 18:35:47, night https://flic.kr/p/24dCRjHDistance 25kmObserver height: 3.85mAir/water temperature: 2-4°C, other weather data https://flic.kr/p/S7aa6iObscured observed: 21.3mObscured on a globe Earth, geometrical: 25.42mObscured on a globe Earth, geometrical with std. 7/6 refraction: 20.45mHeight of Turning Torso: https://flic.kr/p/2f28vnTObservation point: https://www.google.dk/maps/@55.7138615,12.6207295,20z#TurningTorsoFlatEarth
Turning Torso obstructed, no sign of compression or 4m tall waves Mathias Kp 2019-05-07 | Photo taken from 25km of distance and 3.7m of height.1900mm telescope with SLR 1.53 crop factor - 2907mmPhotographs:2019:02:12 16:01:39, day https://flic.kr/p/SFZLay and with 3D https://flic.kr/p/2fP5whP2019:02:12 17:31:44, day/night https://flic.kr/p/24dCS5v2019:02:12 18:35:47, night https://flic.kr/p/24dCRjHAmount obscured matches a refraction coefficient k of ~0.12Distance 25kmObserver height: 3.85mAir/water temperature: 2-4°CObscured observed: 21.3mObscured on a globe Earth, geometrical: 25.42mObscured on a globe Earth, geometrical with std. 7/6 refraction: 20.45mHeight of Turning Torso: https://flic.kr/p/2f28vnTObservation point: https://www.google.dk/maps/@55.7138615,12.6207295,20z#TurninTorsoFlatEarth
Ferry from Bornholmslinjen behind horizon, 30x stabilized, March 19th 2019 Mathias Kp 2019-03-25 | A 30x speed and stabilized version of my 2nd recording of a ferry disappearing bottom up while sailing away. The original footage can be seen here youtu.be/CkWaQrtGcjkDate of footage: 19th March 2019Ferry: marinetraffic.com/en/ais/details/ships/shipid:155510/mmsi:219017081/imo:9501590/vessel:EXPRESS_1da.wikipedia.org/wiki/Express_1The ferry is sailing between Rønne and Ystad, marinetraffic.com/en/ais/home/centerx:14.4/centery:55.2/zoom:9On a different day (19th of March) I used an app to get the position of the ferry. I made a collage with all the needed data to calculate amount obstructed here https://flic.kr/p/2dVCxfRFerry height estimated based on photographs: 24mObserver height: 4.05mDistance: 21.6kmAmount hidden geometrical on globe Earth: 16.3mAmount hidden including std. refraction on globe Earth: 12.9mAmount hidden observed: ~13.3m
Ferry from Bornholmslinjen behind horizon, March 19th 2019 Mathias Kp 2019-03-25 | The first time I filmed this ferry I didn’t have a tripod with me but this time I did. The visibility wasn’t as clear but still good so we can see details on the ferry like the two funnels/chimneys .I also made this video at 30x speed where I centered the footage youtu.be/T3jus582qGcDate of footage: 19th March 2019The ferry is sailing between Rønne and Ystad, marinetraffic.com/en/ais/home/centerx:14.4/centery:55.2/zoom:9Ferry: marinetraffic.com/en/ais/details/ships/shipid:155510/mmsi:219017081/vessel:EXPRESS%201I made a collage with all the needed data to calculate amount obstructed here https://flic.kr/p/2dVCxfRFerry height estimated based on photographs: 24mObserver height: 4.05mDistance: 21.6kmAmount hidden geometrical on globe Earth: 16.3mAmount hidden including std. refraction on globe Earth: 12.9mAmount hidden observed: ~13.3m
Ferry from Bornholmslinjen behind horizon, 30x stabilized, March 11th 2019 Mathias Kp 2019-03-23 | A ferry from Bornholmslinjen disappearing behind the horizon. The original footage was very shaky so I made a stabilized version. I wanted a nice clear timelapse with the ferry center frame. For the best result I had to manual position, scale and rotate each frame. Full video: youtube.com/watch?v=hKcSRwfsDxkThe ferry is sailing between Rønne (Denmark) and Ystad (Sweden), marinetraffic.com/en/ais/home/centerx:14.4/centery:55.2/zoom:9Ferry: marinetraffic.com/en/ais/details/ships/shipid:155510/mmsi:219017081/vessel:EXPRESS%201Thanks to Tim O. (ツღ). and Dandypanty for inspiring me to look into stabilize videoDandypanty: youtube.com/channel/UCmBI0TESWZ3m-b1-dZjO_lg and his stabilized version of the original footage youtube.com/watch?v=oVMxohidO40Tim O. (ツღ) channel youtube.com/channel/UCsmLhV2GZv1-cy2xbvGHXHw
Extreme variable refraction on Turning Torso, full videos Mathias Kp 2019-02-10 | Extreme variable refraction observed over 1.5 hour with zoom camera and an auto level. For a shorter version see youtube.com/watch?v=SmWyi7rM-NMDate: 20th May 2018Air temperature ~25°CWater temperature: ~10-15°C0:13 - Photos0:36 - Video 13:21 Auto level14:23 Auto level15:34 Video17:45 Auto level, photo17:50 Video (22:07 boat with only white mast visible. 20:20 boat with only black sail visible)29:14 Auto level30:53 Auto level, photo30:58 Video#TurningTorsoFlatEarth
Extreme variable refraction on Turning Torso Mathias Kp 2019-02-09 | Some footage I took on a very hot spring day last year. Auto level view side by side at 2:46 and photographs side by side at 3:01. For uncut videos see youtube.com/watch?v=c4U3ca4ZrcYI made an error to some of the timestamps of the footage, see my other video for correct timestamps youtube.com/watch?v=c4U3ca4ZrcY .For the timelapse at 2:21 I had not tighten the tripod head correctly, so the heavy lens made the camera tilt a little bit downwards.Date: 20th May 2018Air temperature ~25°CWater temperature: ~10-15°CDistance to Turning Torso: 25kmObserver height: ~3.7mObservation point: google.com/maps/search/?api=1&query=55.716156,12.625783#TurningTorsoFlatEarth
11 min of Turning Torso obstructed by water Mathias Kp 2019-02-02 | 11 minutes of bottom of Turning Torso obstructed. Tank ship "crushing" small boat at 8:56.Observer height: 3.7mDistance: 25kmAmount obstructed: ~22.2mObservation point: 55.71372°N 12.62046°Egoogle.com/maps/search/?api=1&query=55.71372,12.62046Turning Torso: 55.61282°N 12.97639°Egoogle.com/maps/search/?api=1&query=55.61282,12.97639Segment 1: 0:22-8:55Segment 2: 8:56-9:36Segment 3: 9:37-11:10#TurningTorsoFlatEarth
Mirage, 2h timelapse around sunrise of Turning Torso Mathias Kp 2019-01-27 | Photos of a mirage through 3h, and a 2h timelapse around sunrise.Weather data shown at: 0:40, air -1°C and water 4°C
Mirage, 3h timelapse around sunset, Turning Torso Mathias Kp 2019-01-09 | Photos of a mirage through 8h, and a 3h timelapse after sunset.Weather data shown at: 0:25
Calculating radius of globe Earth using horizon drop Mathias Kp 2018-12-21 | A short video showing how to calculate the radius of a globe Earth using Al-Birunis method with angle of the horizon drop and observation height. The measurements I use are taken from my other video: youtube.com/watch?v=6viR_GJ8998&t=340sResults: https://flic.kr/p/PX2hUFAl-Biruni: en.wikipedia.org/wiki/Al-BiruniHis method: owlcation.com/stem/How-to-Determin-the-Radius-of-the-Earth-Al-Birunis-Classic-Experiment
Atmospheric compression measurements on Turning Torso, from different heights Mathias Kp 2018-11-28 | I thought it would be interesting to take a closer look at atmospheric compression, and how large a role the observer height plays.Two years ago I did some four observations of Turning Torso from four different heights. In those observations there is quite a lot of change in compression, so I made some measurements on them.Observer height: 0.4-17.2mDistance: 28.5kmWeather: Summer (not sure but around 15-25ºC )Results: https://flic.kr/p/28YnNTT#TurningTorsoFlatEarth
Why height matters, Turning Torso Mathias Kp 2018-11-21 | On a globe Earth with atmosphere we would expect obstruction and an amount of drop a little lower than the geometrical calculated value.In this video I show that the closer the sightline is to the water or ground the less the observations matches a globe Earth.The observation of obstruction with the sightline just over water was distorted. The auto level observation from 3.7m showed more drop than expected and from 65.5m we got an intersection just a little less than expected. That’s why height matters, much less variable refraction.#TurningTorsoFlatEarth
DIY, radius of the Earth, using obstruction Mathias Kp 2018-11-12 | Just a quick video to show what kind of value for radius of the Earth one can get using observations of obstruction.Observation video: youtube.com/watch?v=MoK2BKj7QYkObservation heights found from the layer "Danmarks Højdemodel/0,5m": https://sdfekort.dkRadius calculator: metabunk.org/radiusen.wikipedia.org/wiki/De_sphaera_mundi#TurningTorsoFlatEarth
How to fake obstruction on a flat surface Mathias Kp 2018-10-27 | In some videos people claim a flat surface will have obstruction. I took a closer look at that claim.
Can we see further using infrared (IR) on Turning Torso? Mathias Kp 2018-10-22 | The newest thing in flat land seems to be infrared photography, which is actually pretty cool. Let’s take a look at if we can bring back the view of the bottom of Turning Torso when observed from 28.km and with an observer height of 5.9m.If you just want the result, look at 3:00Still image of the comparison, better quality than the video: https://flic.kr/p/2cjX7YF#TurningTorsoFlatEarth
Buoyancy, density, acceleration and pressure Mathias Kp 2018-09-19 | A short video on how to see that buoyancy is a result of acceleration.
Star trails and the shape of the Earth Mathias Kp 2018-09-16 | Star trails seen at 55°N looking towards north, west and south, from 2:09 comparison of my observations with 3D models of globe Earth and flat Earth.
Black ball with visible flat horizon and obstruction v3 Mathias Kp 2018-09-11 | Some people claim a sphere can't have a flat horizon and obstruction at the same time.To test this I used the sculpture Elia, the top is based on a sphere with the radius of 42m.Info on Elia: https://elia.dk/en/
Flat plane vs large sphere vs reality Mathias Kp 2018-09-01 | Comparison of observations on a flat surface/plane, the top of a very large sphere with the radius of 42m, and reality.Some info of the very large sphere, Elia: https://elia.dk/en/Turning Torso video: youtube.com/watch?v=MoK2BKj7QYk
Star trails, east-north-east, 55N Mathias Kp 2018-07-28 | Startrails made from two hours of footage.28th of July 2018Looking east-north-east at latitude 55NFull moon, just after blood moon lunar eclipseCamera: GoPro HERO5 Black at wide "lens setting"Software: StarStaX https://www.markus-enzweiler.de/software/software.html
Zooming in on the horizon of a 150cm big ball Mathias Kp 2018-07-23 | Zooming in on the horizon on a 150cm big ball
Blue ball with visible flat horizon and obstruction v2.0 Mathias Kp 2018-07-23 | I have previously made a video about the flat horizon on a ball, and there were some objections to lack of focus, so I decided to make a new video. Now with a ball with a diameter of about 150cm.I later on made another video with the top of a sculpture, based on a sphere with radius = 42m, youtube.com/watch?v=GDFEc81oP84
Sunset, three cameras, from 76m Mathias Kp 2018-07-17 | Sunset, filmed with three different camerasDate: 1st of July 2018Observer height: 76mWeather data: flickr.com/photos/138443523@N08/42758531764Solar filter put on at:5:0510:2316:3424:1429:5232:58
Weird sunset, warm summerday Mathias Kp 2018-07-14 | Sunset observed with Sony NEX-6 and a MC MTO-11CA 1000mmObserver height: 76mDate: July 1st 2018Location: 56.559670 N, 8.326426 EWeather: Warm summer day
Sunset, three cameras, from 14m Mathias Kp 2018-07-10 | Sunset observed with different cameras/lenses/filters.Observer height: 14mDate: 2018-06-30Location: 56.52776 N, 8.11822 EWeather: Warm summer day, more data here flickr.com/photos/138443523@N08/29458671118
Midsummer night timelapse, Denmark Mathias Kp 2018-06-30 | A timelapse of nine hours. From 9 in the evening to 6 in the morning. With about six hours of the Sun being below the horizon.Location Lemvig, Denmark https://www.google.dk/maps/place/56.5747,8.2867
Blue ball with visible flat horizon and obstruction Mathias Kp 2018-06-24 | Just a quick illustration to show a ball can have a visible flat horizon, and at the same time obstruction. The ball I use only has a radius of 25cm, a much better demonstration by Movie Vertigo using a globe with a radius of 150cm youtube.com/watch?v=aMY9Vd8Ym5Q
Græskarplante, timelapse, 24 timer på ét minut Mathias Kp 2018-06-11 | Græskar plante (Atlantic Giant). 24 timer på ét minut, 50 dage siden frøet blev sået og 40 dage siden planten spirede.Pumpkin plant (Atlantic Giant). 24 hour in one minute, 50 days since the seed was planted, and 40 days since the plant sprouted.
Sunshine on a plane after sunset Mathias Kp 2018-06-10 | Just after sunset I captured this plane fully lit by sunshine. It makes you wonder how is that possible?
Perspective vs a curved surface Mathias Kp 2018-06-06 | Perspective vs a curved surface in 1min. Which one can hide the bottom of objects?
Græskar kimplante timelapse, 3 dage på et minut Mathias Kp 2018-05-04 | Græskar af sorten Atlantic Giant spirer. Sidste del dag 7 til sidste på dag 10 på ét minut.Pumpkin seed sprouts, last part of day 7 to the end of day 10.
Timelapse 2h, Charlottenlund to Turning Torso Mathias Kp 2018-04-27 | Timelapse 2h, 20x speed, Charlottenlund to Turning Torso. Also check out the more in dept video youtube.com/watch?v=FPo77ukuHF8Camera height: 17.2mDistance to Turning Torso: 28.5kmAir temperature: 1-3°CWater temperature: 2-3°CDay photograph: https://flic.kr/p/26z9zneNight photograph: https://flic.kr/p/26z9z8M#TurningTorsoFlatEarth
Using auto level to measure Earth surface drop on Turning Torso Mathias Kp 2018-04-26 | With an auto level I measured the visual drop of the surface of the Earth. If you just want the results fast forward to 10:20.Instrument used: Leica NA 332If you doubt the auto level is level, then the crane on the island can be used as a control "stick", flickr.com/photos/138443523@N08/42549428402Comparison of globe Earth and flat Earth: flickr.com/photos/138443523@N08/41763459452Weather data at 9:43LiDAR pointcloud: 1:14Air temperature: 1-3°CWater temperature: 2-3°CTimelapse, 20x speed: youtube.com/watch?v=GHuv4cCwPgcDay photograph, 15:00: https://flic.kr/p/26z9zneNight photograph, 20:44: https://flic.kr/p/26z9z8MDay/night overlay: https://flic.kr/p/GVjs6RCalibration, two peg test: https://flic.kr/p/26BCcBn#TurningTorsoFlatEarth
Sun , April 19th 2018, from Lemvig, Denmark Mathias Kp 2018-04-19 | Footage of the Sun, taken on April 19th 2018 at 6:52 from Lemvig, Denmark. google.com/maps/place/56.547040,8.300246
Timelapse 2h, Amager Strand to Turning Torso Mathias Kp 2018-04-15 | Timelapse 2h, 20x speed, Amager Strand to Turning Torso. Ships crossing at: 2:21 2:24 3:03 3:18. Also check out the more in dept video youtube.com/watch?v=hEAyKb8wSZYBecause of the wind the camera moves a little bit. So I also made a timelapse 1 frame per 5min with framegraps positioned at the same point over each other, minimizing the effect from the wind: youtube.com/watch?v=hEAyKb8wSZY&t=81sCamera height: 0.8mDistance to Turning Torso: 21kmAir and water temperature, 2-3°CMore weather data can be seen here, https://flic.kr/p/24MHUuK Observation point: http://maps.google.com/maps?q=55.6523,12.64811Height of Turning Torso, https://flic.kr/p/UHaPbQDaylight photo, https://flic.kr/p/24LsFgMNight photo, 5sec, https://flic.kr/p/24LsEXvNight photo, 10sec, https://flic.kr/p/GtqNua#TurningTorsoFlatEarth
Why is the bottom part of Turning Torso behind water? Mathias Kp 2018-04-14 | Two hour timelapse of the view to Turning Torso over 21km, starts at 1:14 . No sign of varying refraction or mirages. Still the bottom part 22m is obscured by water, while observing from 0.8m. Air and water temperature, 2-3°CMore weather data can be seen here, https://flic.kr/p/24MHUuKCamera position: http://www.google.com/maps/place/55.65236,12.64811Height of Turning Torso, https://flic.kr/p/UHaPbQDaylight photo, https://flic.kr/p/24LsFgMNight photo, 5sec, https://flic.kr/p/24LsEXvNight photo, 10sec, https://flic.kr/p/GtqNua#TurningTorsoFlatEarth
Drop of the horizon, measured with theodolite, 5m to 184m Mathias Kp 2018-03-10 | In this video I show how to measure the drop of the horizon from eyelevel, using a theodolite. I have done nine observations from 5m to 184m of altitude. The measurements from these nine altitudes and locations I then compare to what we would expect with the globe Earth model (a sphere with the radius of 6371km). I also estimate the influence of mirages. If you just want the conclusion go to 31:18. Data can also be seen on https://flic.kr/p/DjjzjxTable of Contents:01:15 Accuracy and precision test04:42 Error correction05:08 Comparison with globe Earth and refraction05:46 Measurement at 5m08:55 Measurement at 20m12:01 Measurement at 36m15:00 Measurement at 43m, at 15:55 a ship is sailing by on the horizon17:32 Measurement at 59m, at 18:25 ship is sailing by on and below the horizon20:53 Measurement at 72m23:38 Measurement at 97m25:40 Measurement at 127m27:47 Measurement at 184m29:22 Mirages31:21 ConclusionTheodolite model: Geo-Fennel FET 500Link to manual for the theodolite: http://www.geo-fennel.de/uploads/tx_produkte/FET_500.pdfAbout refraction, take a look at Hirt et al. 2010: Refraction Coefficient Monitoring http://onlinelibrary.wiley.com/doi/10.1029/2010JD014067/full
Sunset 7m, January 7th 2018 Mathias Kp 2018-01-14 | Sunset, January 7th 2018, DenmarkSunset starts at: 16:25 and ends around 21:39Bottom of ship below horizon at 22:46Position: 56.5782N 8.1339E
ISS lunar transit, Lemvig Denmark, January 8th 2018 Mathias Kp 2018-01-08 | ISS lunar transit at 5min and 33 sec past 5 o’clock, precisely as predicted by https://transit-finder.com. The calculation behind this is really amazing. Composite of the total transit can be seen here, https://flic.kr/p/Jn3Er2A new version with some text added, can be seen here: youtu.be/A4_jwTC2tGACamera: Canon PowerShot SX60 HSVideo: FHD 60 fpsShutter speed: 1/125 secAperture: f/6.5Focal length: 1365mmISO: 100Date: January 8th 2018Location: Lemvig, Denmark
Den flade horisont på en kugleformet Jord Mathias Kp 2018-01-06 | Hvis Jorden er en kugle, burde horisonten bue lidt nedad og være under vandret. I denne video viser jeg at det dog er så lidt at det næppe er synligt, men med en teodolit er det faktisk muligt at måle vinklen fra vandret. Jeg har gentaget denne form for måling ni forskellige gange fra 5m til 184m højde, på billedet her ses resultatet https://flic.kr/p/Djjzjx .
Measuring 8in per mile squared on Turning Torso, using a theodolite Mathias Kp 2017-11-14 | 8 in per mile squared is the allegedly drop of a horizontal line, on the globe model of the Earth. In this video I will show if I using a theodolite can measure this drop. The first part of the video deals with finding first hand accurate height measurements for the observation point and for Turning Torso, the result can be seen at 11:50Table of contents:Height of observation point, 1:08Ground height at Turning Torso, 2:43Height and dimensions of Turning Torso, 3:55Calculations of drop on a globe Earth, 7:27Calculations of refraction on a globe Earth, 7:50Theodolite observation, 8:36Error of measurement, 11:15Result, 11:50As you might notice this footage was recorded in windy conditions which caused the theodolite to move a little bit up and down. It would have been better to do the observation in less windy weather, but the visibility this day was exceptional clear, and most other days it will not be this clear. So I favored clear bouncy footage over blurry still footage. The preferred way to measure with a theodolite is to do several observations turning the theodolite 180 degrees to minimize errors. But since I thought the error from the wind would be larger I chose not to, and also to simplify the observation for a later video. Looking back, I should properly have done more observations, since the uncertainty of intersection caused by the wind, could be averaged to minimize the error. When measuring with a theodolite it is also important to have it calibrated on a regular basis. Since I just bought this theodolite and it had been stored away for some time, it properly has not been calibrated for a long time. I should have followed the prescribed method for calibrating the theodolite before using it, but I didn’t. Testing the theodolite afterwards I can see it has a small error, and also since it does not have an electronic angle reader there is also a small error from how precise I can position the telescope. From my testing this might lead to an error as large as 8m/26ft when used over a distance of 29.14km/18.11mi. Using a well calibrated professional electronic theodolite will likely reduce this possible error significant.When I combined the estimated error of measurements I used a loose simple summation, and not the proper scientific way in order to keep the video as simple as possible.Theodolite model: Geo-Fennel FET 500Link to manual for the theodolite: http://www.geo-fennel.de/uploads/tx_produkte/FET_500.pdf The observation with the thodolite was done on the 27th of October 2017.Altimeter measurements were done from March to August 2017. Weather conditions from https://www.dmi.dk/vejr/arkiver/vejrarkiv/:Highest temperature of the day: 11 °CAverage temperature of the day: 10 °CLowest temperature of the day: 7 °CHumidity: 86 %Air pressure: 1015 hPaHighest wind speed: 17 m/sHighest wind speed, average 10 min: 13 m/sDirect sunshine: 2 hours#TurningTorsoFlatEarth
Horizon measured below eye level using theodolite Mathias Kp 2017-10-24 | I have bought this used mechanical theodolite for about 250€. It is not the most accurate model, but accurate enough to get an idea of the drop of the horizon.Theodolite model: Geo-Fennel FET 500Link to manual for the theodolite: http://www.geo-fennel.de/uploads/tx_produkte/FET_500.pdfLink to discussion on how to calculate the drop of the horizon using the globe Earth model, http://physics.stackexchange.com/questions/139348/why-does-the-sea-horizon-line-always-seems-to-be-at-the-same-height-as-ones-eye
