TOOL) – Online Photoperiod Calculator: Computation of Sunrise, Sunset and Twilight Times (fail-safe) | J. Lammi – 📚 Glossarissimo!
![Sun rise, set and twilight times calculated using a simple iterative scheme and implemented as a QBASIC program, an Excel spreadsheet using VBA and as a plain spreadsheet. Sun rise, set and twilight times calculated using a simple iterative scheme and implemented as a QBASIC program, an Excel spreadsheet using VBA and as a plain spreadsheet.](http://www.stargazing.net/kepler/sunsheet.gif)
Sun rise, set and twilight times calculated using a simple iterative scheme and implemented as a QBASIC program, an Excel spreadsheet using VBA and as a plain spreadsheet.
![Solar Time, Angles, and Irradiance Calculator - User Manual | New Mexico State University - BE BOLD. Shape the Future. Solar Time, Angles, and Irradiance Calculator - User Manual | New Mexico State University - BE BOLD. Shape the Future.](https://pubs.nmsu.edu/_circulars/CR674/images/fig8_opt.jpeg)
Solar Time, Angles, and Irradiance Calculator - User Manual | New Mexico State University - BE BOLD. Shape the Future.
![SunCalc - sunrise, sunset, shadow length, solar eclipse, sun position, sun phase, sun height, sun calculator, sun movement, map, sunlight phases, elevation, Photovoltaic system, Photovoltaic SunCalc - sunrise, sunset, shadow length, solar eclipse, sun position, sun phase, sun height, sun calculator, sun movement, map, sunlight phases, elevation, Photovoltaic system, Photovoltaic](https://www.suncalc.org/img/suncalc.png)