The Analemma

A Graphic Explanation

SunGraph

CirrusPerformance for iPhone

SunGraph for iPhone

METARspk for iPhone

Sunrise, Sunset calculator
for Mac and PC

CirrusPerformance

Weight & Balance for Cirrus SRxx Aircraft(Mac and PC)

CessnaPerformance for iPhone

Bike Maps

Fractamations

Fractals in motion!