A ferry from Bornholmslinjen hiding behind the horizon, March 11th 2019 @MathiasKp

Uploaded March 2019 | Updated September 2026, 1 week ago

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=oVMxohidO40

The ferry is sailing between Rønne (Denmark) and Ystad (Sweden), marinetraffic.com/en/ais/home/centerx:14.4/centery:55.2/zoom:9
Ferry: marinetraffic.com/en/ais/details/ships/shipid:155510/mmsi:219017081/vessel:EXPRESS%201

On 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/2dVCxfR
Ferry height estimated based on photographs: 24m
Observer height: 4.05m
Distance: 21.6km
Amount hidden geometrical on globe Earth: 16.3m
Amount hidden including std. refraction on globe Earth: 12.9m
Amount hidden observed: ~13.3m

$A ferry from Bornholmslinjen hiding behind the horizon, March 11th 2019 In this video I show how ships disappear bottom up behind the horizon. I didnt have a tripod with me so the footage is very unstable. Dandypanty made a stabilized version: https://www.youtube.com/watch?v=oVMxohidO40 The ferry is sailing between Rønne (Denmark) and Ystad (Sweden), https://www.marinetraffic.com/en/ais/home/centerx:14.4/centery:55.2/zoom:9 Ferry: https://www.marinetraffic.com/en/ais/details/ships/shipid:155510/mmsi:219017081/vessel:EXPRESS%201 On a different day (19th of March) I used an app to get the position of the ferry. I made a collage with all the needed data to calculate amount obstructed here https://flic.kr/p/2dVCxfR Ferry height estimated based on photographs: 24m Observer height: 4.05m Distance: 21.6km Amount hidden geometrical on globe Earth: 16.3m Amount hidden including std. refraction on globe Earth: 12.9m Amount hidden observed: ~13.3m$

$Turning Torso obstructed, no sign of compression or 4m tall waves Photo taken from 25km of distance and 3.7m of height. 1900mm telescope with SLR 1.53 crop factor - 2907mm Photographs: 2019:02:12 16:01:39, day https://flic.kr/p/SFZLay and with 3D https://flic.kr/p/2fP5whP 2019:02:12 17:31:44, day/night https://flic.kr/p/24dCS5v 2019:02:12 18:35:47, night https://flic.kr/p/24dCRjH Amount obscured matches a refraction coefficient k of ~0.12 Distance 25km Observer height: 3.85m Air/water temperature: 2-4°C Obscured observed: 21.3m Obscured on a globe Earth, geometrical: 25.42m Obscured on a globe Earth, geometrical with std. 7/6 refraction: 20.45m Height of Turning Torso: https://flic.kr/p/2f28vnT Observation point: https://www.google.dk/maps/@55.7138615,12.6207295,20z #TurninTorsoFlatEarth$

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