To use it you just put in the distance to the object in miles and your height above the surface in feet.

The Metabunk curve calculator was written to provide a simple answer to the question: "how much of a distant object is hidden by the curve of the earth from a certain distance and view position". The following diagram is an exaggerated look at the numbers involved.

...

Earth's Curve Calculator]]>

Source: https://www.youtube.com/watch?v=DxGHbwL3pig]]>

The Nikon P900 occupies a special place in many topics discussed on Metabunk. It's a fairly lightweight "bridge" camera that has a ridiculously powerful zoom lens. It's described as 83x, or the equivalent of a 2000mm lens on a normal 35mm SLR camera. It replaced the need to carry around several pounds of equipment to get super-zoomed shots. This made it an...

Converting Nikon P900 to IR/Full Spectrum - The Definitive Guide]]>

https://www.metabunk.org/KMLTool/

The Metabunk KML tool takes one KML/KMZ file containing a Google Earth camera (and optionally some other stuff) and spits out a KMZ file that contains a variety of useful stuff. The initial intent of the tool was simply to show the view volume in Google Earth, to help understand what the viewer was looking at. This rapidly evolved as I just kept adding things, like various plane (eye level, horizon), and lines of...

KML Tool For Visualizing Google Earth Cameras, and More]]>

This is what it looks like:

For the flat earth, it's simple trig - tan(x)=(target height-observer height)/distance - while for the sphere earth, it works by calculating a series of isosceles triangles:

I had done this is in...

Calculator for viewing angles]]>

Currently the tool is hosted...

Direction to Sun vs. Sun position above the AE map visualization]]>

I did a few experiments in daylight, shining a laser at a tree about 330 feet (100m) away.

From this...

Improving the Laser Dot Rendering in The Refraction Simulator]]>

First of all, here's the diagram of what it's calculating:

I've gone about it three different ways, firstly two using the drop...

Earth curve calculator for obstructions]]>

This is the discussion thread for the Metabunk Refraction Simulator (previously called the

https://www.metabunk.org/refraction/

How to use it:

Source: https://www.youtube.com/watch?v=8zzEWy5SGKg

Technical Explanation

Source...

Simulating Atmospheric Refraction]]>

Here's the simulator:

https://www.metabunk.org/gas/

Here's the thread that started it.

https://www.metabunk.org/why-does-the-atmosphere-not-fly-off-into-the-vacuum-of-space.t10098/

I plan to add walls (and hence containers). The video above was before I added the "floor" controls, and the ability to add and remove molecules...

Gas Universe Simulator]]>

https://www.metabunk.org/radius/

For the math we take the curve calculator and just reverse the equations. We have:

Distance to horizon, a = sqrt((r+h)*(r+h) - r*r)

Amount...

Earth's Radius Calculator (from the amount a distant object is obscured)]]>

This can be embedded in a post with AEP tags, like:

[AEP].[/AEP]]]>

Sometimes graphs are presented with a logarithmic vertical scale. This is useful for seeing the detail in the smaller range, but can give a misleading impression about how much a value is changing.

I wrote a no-frills tool to convert such images. It take as input a URL of a

Convert Graph Image from Log Scale to Linear Scale]]>

https://www.metabunk.org/flat/

I wrote a flat vs. globe route simulator over the weekend. It shows the shortest route between two points on a globe, a flat earth, and an standard map. The lengths of each route are calculated for the globe and the flat earth.

(Note: does not work on mobile devices, works best with Chrome)]]>

Last year I created a physical model to illustrate some aspects of the WTC Tower collapses. The basic structure was columns connected by floors. The floors supply lateral stability to the columns, so when the floors are removed the columns are very unstable. This worked out reasonably well, and I got this nice demonstration from it...

A virtual model illustrating some aspects of the collapse of the WTC Towers]]>

I've started on a calculator to convert RHw (relative humidity with respect to water) to RHi (relative humidity with respect to ice).

https://www.metabunk.org/rh

Currently it just takes RHw, temperature and pressure, and then gives you the RHi, and the value of RHw at which RHi is 100% (i.e. the value at which contrails will persist)

Note the pressure has very little effect, the relationship is more one of temperature.

I will expand this calculator to make...

Calculator for RHi and Contrail Persistence Criteria]]>

Note this is actually two different contrail simulators - the default shows two intersecting flight paths creating a grid, the other shows a racetrack contrail forming a pattern, you can toggle between them with the checkbox in the lower left.

The key point that is being...

Contrail Pattern Simulator]]>