Home      About      Contact      Submit an Item      
Passive    PV    Homes    Commercial    Wind    Projects    DIY    Resources    Tools    Materials    
Watch Cargotecture in Kansas City Thumbnail

Cargotecture in Kansas City Video

Watch Innovative Vertical Axis Wind Turbine

Innovative Vertical Axis Wind Turbine

Watch History Organic Architecture Thumbnail

History Project Organic Architecture Video






Solar Position Calculator

Solar zenith angle, declination, equation of time, etc.

This calculator program returns solar zenith angle, declination, Julian day, equation of time, hour angle, instantaneous and daily extraterrestrial radiation values, and sunrise and sunset times. Equations were provided by the National Renewable Energy Laboratory.