## Category: Math and Science

### A Rotation by One Turn is 1

In Michael Hartl’si Tau Manifestoiiiii, he addresses a criticism of the Tau formulation which points out that the -form of Euler’s equation only relates 4 fundamental constants (e, i, circle constant, and 1), while the -form relates 5 (despite needing to be re-arranged to do so). In response, he jokingly tacks on a trivial ‘+0’ […]

### How to handle Percent Change and CAGR for negative numbers

Sometimes finance deals with negative quantities that become less negative over time. For example, consider a profit/(loss) of (\$50M) in year 1 that becomes a profit/(loss) of only (\$1M) in year 4. If we apply the traditional formulas for Percent Change and Compound Annual Growth Rate (CAGR), we find that the results do not align […]

### How to Measure Temperature with a Thermistor

An NTC (Negative Temperature Coefficient) Thermistor is a passive electrical component whose resistance varies inversely with temperature.i It is often used as a temperature sensor. The relationship between resistance and temperature can be described with the ‘beta’ formula. In this experiment we will show how to use the National Instruments myDAQii in conjunction with LabVIEWiii […]

### Waterfall Charts

Are you looking for an easy to use, versatile Waterfall Chart template for Microsoft Excel? The Waterfall Chart, also known as a Bridge, a Walk, flying bricks, or a Mario Charti, is a most useful visualization for a variety of applications. It can be used to ‘walk’ from a beginning value to an ending value, […]

### Galaxy Empire

Galaxy Empire  A resource for calculators, simulators, charts, formulas, and secrets. Conquer the Galaxy, One Planet at a Time. In the near distant future, space exploration has evolved into a much more sophisticated nature as planets are colonized by humans in a fierce battle for resources and influence. Immerse yourself in intergalactic diplomacy as you […]

### How Far Away is the Horizon?

As I sit in my 30th storey flat, looking over a SimCity-esque grid of city buildings and rooftops, I wonder, “How far away is the horizon?” At what distance do those concrete and brick structures fade into obscurity? If I squint hard, can I see Russia? First, let us assume perfect visibility and ignore […]