This is the Blog of Walter Bislin. I like to program interactive animations and to share my knowledge as an engineer.

This page shows scenes computed with a Globe Model and a Flat-Earth Model of the Earth and compares them with corresponding Real Images of the same scene to see, which Model-Predictions match Reality.

The interactive Refraction Simulator on this page renders scenes as seen on atmospheric conditions you can provide. It is an accurate simulation of Atmospheric Refraction for both Globe Earth and Flat Earth. The simulation predicts what we can expect to observe in reality.

This App shows how a circle given by its center in latitude *φ* and longitude *λ* and its radius *s* along the surface of the globe earth looks like, if its curve is projected from the globe to the flat earth. I show the formulas used, derived by myself, and the source code of the working App.

Friday, October 19, 2018 - 01:51 | Author: wabis | Topics: FlatEarth, Mathematics, Geometry, Interactive

FECore's official conclusion from their LASER Level Experiments "no curve is detectable" and "FECORE measurements disprove the WGS84 model" (WGS84 is the official globe model) is based on errors in the calculations, using Snell's law wrong, assuming a flat earth and a wrong physical model of the atmosphere. In this article I show all errors made by FECore to come to the false conclusion.

Proving we live on a Globe using only paper, scissors and glue to build an Equinox Sundial. I show in an interactive animation how such a Sundial works everywhere on the Globe and give you the blueprints to build your own Equinox Sundial. Thanks to Wolfie6020 who made a video introducing this page.

In the coordinate system of the sun, the moon tracks a weird path, sometimes speeding up, sometimes slowing down. At the nearer side to the sun the moon gets attracted more by the sun than at the further side. The sun is much bigger than the earth and its attracting force is bigger than that of the earth. So why is it that the moon does not left earth's orbit and crash into the sun? I give the detailed explanation in this article, which includes an interactive simulation.

Wednesday, September 5, 2018 - 01:30 | Author: wabis | Topics: Simulation, Interactive, Space, Physics

This calculator can be used to compute the effective gravitational acceleration, the pure gravitational acceleration and the centrifugal acceleration for any point on the Reference Ellipsoid of the earth for both surface and at altitude according to the model WGS84.

Saturday, September 1, 2018 - 20:45 | Author: wabis | Topics: Calculator, Knowlegde, Mathematics, Physics

Use this calculator to calculate and visualize what we can see of a target of a certain size and distance from any observer altitude, taking refraction into account. You can compare the results between flat earth and globe earth. Many more values are calculated and you can customize and store the settings.

Friday, August 31, 2018 - 17:54 | Author: wabis | Topics: FlatEarth, Calculator, Knowlegde, Geometry

The Cavendish experiment can be used to show that mass attracts mass according to Newton's law of universal gravitation. Creating such an experiment is very challenging because the gravitational forces involved are tiny, about in the nano Newton range. This simulation can be used to plan an experiment and to verify whether the outcome is likely the result of gravity or other influences. The math involved is explained and the source code of the simulation is available.

Special Relativity was originally based on two postulates: the Principle of Relativity and the constancy of the speed of light. In this article I explain an attempt to drop the light postulate from Special Relativity. I show that the speed of light is a general speed limit. The value for this speed limit is a consequence of how we define length and time units.

This App is my Contribution to the Search and Rescue Contest of Wolfie6020. The App computes a Search Pattern from given Locations of an Airport Base and a Most Probable Position (MPP) of a search target, given some Airplane and Mission Parameters.

**Note: This App may not be used for real Search and Rescue Operations. It is for demonstration purposes only!**

There is a famous formula that Flat Earthers frequently use to calculate the curvature of the Globe Earth. This formula is an approximation. It is commonly under- or overestinated how accurate this approximation is. Here I give the accuracy of the approximation and derive the exact formulas and the approximation 8" per miles squared and compare the results in a Calcularor Form.

Monday, April 16, 2018 - 17:52 | Author: wabis | Topics: FlatEarth, Calculator, Mathematics, Geometry

Here is an interactive Flat Earth Model that can explain Sunrise, Sunset, Moonrise, Moonset, Moon Phases, Moon's apparent rotation, Sun's position on Equinox, Seasons, Solar and Lunar Eclipses, Star Trails, 24 hours Day/Night at the Northpole and Antarctica, Celestial Poles, why people south of the equator can see the same Stars rotate clockwise around a singe celestial pole at the same time at different continents. But the Model still has some unsolvable flaws.

For us living beings on the surface of the earth, the earth looks flat. For this reason the so-called Flat-Earther (FE) claim that the earth is a flat plane rather than a globe.

With the help of a simulation, I show, up to what altitudes the earth appears flat, although it actually has a spherical shape. Using some animations, you can learn how to recognize the curvature of the earth, or in what circumstances it appears flat. The simulation can also simulate refraction. I prove by means of photos, how the simulation depicts reality, by superimposing the simulation results onto photos.

Run Curvature App in a separate Window

Wie stark ist die Krümmung der Erde? (German Version)

Saturday, December 30, 2017 - 20:47 | Author: wabis | Topics: FlatEarth, Calculator, Animation, Knowlegde

To comprehend how curvature on a globe is expected to look like, we have to comprehend how perspective distortions look on a Globe. In this article you can play with an App showing a grid of a Globe Model to see how it is distorted by perspective especially when viewing from low altitudes.

Saturday, December 30, 2017 - 20:47 | Author: wabis | Topics: FlatEarth, Knowlegde, Geometry, Interactive

For the first time in 50 years, a technical trick is used to create true color images of the entire earth with the help of the new weather satellite Himawari 8 (Japan) and combine them into video sequences. The pictures and video sequences are freely available. Here, a sequence of original shots and a video in true colors can be viewed and I explain how the true color images are computed from the original data.

Echtfarb-Aufnahmen der Erde vom Satelliten Himawari der JMA

Thursday, December 7, 2017 - 00:25 | Author: wabis | Topics: Knowlegde, Space, Animation, Interactive

According to geodetic measurments the shape of the earth is not exactly a sphere, but slightly bulged at the equator - oblate spheroid. In this article I show, that this small deviation from a perfect sphere can be measured on high resolution satellite images.

Deutsch: Können wir die Abplattung der Erde in Satellitenbildern sehen?

This App lets you create a Flight Plan based on the Flat Earth Model.

**Note: This Flight Plans must not be used in real flights, because the plans produced by this App are not accurate, because the earth is not flat but a globe.**

Thursday, September 7, 2017 - 01:37 | Author: wabis | Topics: FlatEarth, Calculator, Aviatic, Interactive

On different images of the earth from space the continents appear in different sizes, as in the picture above North America from 2002 and 2012. This has to do with Perspective and the distance of the camera from the Earth. Here I show in an animation how this effect works.

Deutsche Version: Das Wahre Gesicht der Erde, Kameradistanz spielt eine Rolle

I derive the formulas to compute the distance between two points for both models. The computations can be carried out using a calculation form. An example is then used to decide which model corresponds to reality.

Tuesday, May 23, 2017 - 21:27 | Author: wabis | Topics: FlatEarth, Calculator, Geometry, Mathematics

Animation (3)

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Calculator (8)

FlatEarth (14)

Geometry (6)

Interactive (9)

Knowlegde (13)

Mathematics (6)

Physics (5)

Science (1)

Simulation (3)

Space (3)

wabis (21)