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⇒ Calculator: Parallax Triangles
The presented Calculator can be used to calculate distances to objects from Parallax measurements. It also can be used for triangle calculations where we only know the baseline, an opposite angle and the point where the height meets the baseline. Also provided is the derivation of the used equations.
Sunday, December 1, 2019 - 23:57 | Author: wabis | Topics: Geometry, Mathematics, Calculator
⇒ Gravitational Acceleration and Potential Field of a Cylinder
This page provides a Numerical calculation of the gravitational acceleration and gravitational potential field around and inside a cylinder with homogeneous density. It shows that the gravitational field has no center of gravity like a sphere, but in the limit of big distances it can be treated as a point mass or sphere with the same mass.
Friday, November 22, 2019 - 20:14 | Author: wabis | Topics: Physics, Mathematics, Interactive, Simulation
⇒ The Rainy Lake Experiment
The Rainy Lake Experiment was designed to show, how we can figure out the shape of the earth, Flat or a Globe, by observing and measuring a clever arrangement of targets over a distance of 10 km, taking terrestrial refraction into account and using modern equipment. The experiment is an advanced version of the Bedford Level experiment executed in 1838. The Experiment leads to the conclusion that the earth must be a Globe with a radius of 6371 km.

Rainy Lake Experiment Animation
walter.bislins.ch/RainyLakeAnimation

Link to here:
walter.bislins.ch/RainyLake

Short Version of the Report
In a Nutshell, e.g. for Presentations

Saturday, July 20, 2019 - 00:50 | Author: wabis | Topics: FlatEarth, Knowlegde, Science, Experiment
⇒ Flat-Earth: Finding the Curvature of the Earth
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.
Monday, January 7, 2019 - 22:57 | Author: wabis | Topics: FlatEarth, Calculator, Animation, Knowlegde | Comments(54)
⇒ Comparison of Globe and Flat-Earth Model Predictions with Reality
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 and experiments to show, which Model-Predictions match Reality.
Monday, December 3, 2018 - 23:15 | Author: wabis | Topics: FlatEarth, Interactive | Comments(35)
⇒ Simulation of Atmospheric Refraction
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.

Link to here: walter.bislins.ch/RefractionSim

Thursday, November 22, 2018 - 21:50 | Author: wabis | Topics: Simulation, Interactive, Physics | Comments(16)
⇒ Gravity on an infinite Flat Earth Plane
Could a infinitely large Flat Earth with a certain thickness b and density ρ produce a gravitational acceleration according to Newtons law of gravitation of g = 9.806 m/s2 that has no center of gravity, but is the same magnitude everywhere?
Tuesday, May 7, 2019 - 01:09 | Author: wabis | Topics: FlatEarth, Mathematics
⇒ Globe Arc Projection to Flat Earth
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
⇒ Creating an Equinox Sundial made of Paper
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.
Saturday, September 22, 2018 - 02:02 | Author: wabis | Topics: FlatEarth, Knowlegde, Space | Comments(8)
⇒ Gravity and how the Heliocentric Model works
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.

Link to here: walter.bislins.ch/Helio

Wednesday, September 5, 2018 - 01:30 | Author: wabis | Topics: Simulation, Interactive, Space, Physics | Comments(6)
⇒ Earth Gravity Calculator
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
⇒ Advanced Earth Curvature Calculator
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.

Link to here: walter.bislins.ch/CurveCalc

Friday, August 31, 2018 - 17:54 | Author: wabis | Topics: FlatEarth, Calculator, Knowlegde, Geometry
⇒ Cavendish Experiment Simulator
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.
Friday, July 27, 2018 - 00:56 | Author: wabis | Topics: Simulation, Interactive, Physics, Knowlegde | Comments(5)
⇒ Derivation of Special Relativity from basic observable Principles
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.
Friday, June 8, 2018 - 21:58 | Author: wabis | Topics: Knowlegde, Mathematics, Physics
⇒ Search and Rescue Mission Contest
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!

Sunday, May 20, 2018 - 21:12 | Author: wabis | Topics: Aviatic, Calculator, Knowlegde
⇒ Eight Inches per Miles squared Formula Derivation
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 Calculator Form.
Monday, April 16, 2018 - 17:52 | Author: wabis | Topics: FlatEarth, Calculator, Mathematics, Geometry | Comments(2)
⇒ Flat Earth Dome Model
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.

Link to here: walter.bislins.ch/FED

Friday, April 6, 2018 - 22:00 | Author: wabis | Topics: FlatEarth, Interactive, Knowlegde | Comments(63)
⇒ Perspective on a Globe
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.

 Globe Perspective App

Saturday, December 30, 2017 - 20:47 | Author: wabis | Topics: FlatEarth, Knowlegde, Geometry, Interactive | Comments(2)
⇒ Real-Color images of the earth from the satellite Himawari (JMA)
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.

 Deutsch: Echtfarb-Aufnahmen der Erde vom Satelliten Himawari der JMA

Thursday, December 7, 2017 - 00:25 | Author: wabis | Topics: Knowlegde, Space, Animation, Interactive | Comments(4)
⇒ Can we see the Oblateness of the Earth on Satellite Images?
According to geodetic measurements 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?

Sunday, October 15, 2017 - 01:45 | Author: wabis | Topics: FlatEarth, Knowlegde
⇒ Creating Flight Plans for Flat Earth
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 | Comments(22)
⇒ The True Face of the Earth, Camera Distance matters
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

Friday, July 21, 2017 - 01:21 | Author: wabis | Topics: FlatEarth, Knowlegde, Animation, Geometry | Comments(2)
⇒ Distances on Globe and Flat Earth
Flat Earth and Globe Earth are two models for the earth that are very different in geometry. In order to decide which model matches reality, we can calculate the shortest distance between two points for both models and check which distance corresponds to reality.

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 | Comments(51)
⇒ Centrifugal and Gravitational Acceleration in an Aircraft
In a fast-flying aircraft, a maximum centrifugal acceleration acts away from the earth so that a part of the earth's attraction force is canceled out and therefore one is slightly lighter in the aircraft than on the ground.

In this article, this effect can be calculated with a calculation form. The calculation is verified by means of a real flight. In addition, all the formulas used are listed and explained.

 Deutsche Version: Zentrifugal- und Gravitationsbeschleunigung in einem Flugzeug

Wednesday, January 25, 2017 - 00:08 | Author: wabis | Topics: FlatEarth, Calculator, Knowlegde, Aviatic, Mathematics | Comments(3)
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