Black ball with visible flat horizon and obstruction v3 @MathiasKp

Uploaded September 2018 | Updated September 2026, 1 week ago

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/

Black ball with visible flat horizon and obstruction v3

Timelapse 2h, Charlottenlund to Turning Torso

$Why height matters, Turning Torso On a globe Earth with atmosphere we would expect obstruction and an amount of drop a little lower than the geometrical calculated value. In this video I show that the closer the sightline is to the water or ground the less the observations matches a globe Earth. The observation of obstruction with the sightline just over water was distorted. The auto level observation from 3.7m showed more drop than expected and from 65.5m we got an intersection just a little less than expected. That’s why height matters, much less variable refraction. #TurningTorsoFlatEarth$

How to visual with GeoGebra measure lean and obstruction on a sphere

Mrs S shows Rowbotham is wrong on obstruction on a flat surface

Ferry from Bornholmslinjen behind horizon, May 5th 2019

Ship (Norden) sailing towards the horizon

The moon up close with a superzoom camera