I made this library for a personal project and thought it might be useful to others: [image] GitHub - jpb10/SolarCalculator: Arduino library to calculate the times of... Arduino library to calculate the times of sunrise, sunset, solar noon, twilight, the solar position, and more. - GitH…

[image] Idahowalker: I noticed that doubles are used, on a Uno those would just be floats and on an ESP32 those would be 64bit floating point numbers. On a ESP32 is a 64bit floating point number necessary? [...] " * Arduino's single precision floating numbers have the equivalent of 24 * log10(2…

[image] jpb10: You could also use the horizontal coordinates (azimuth and elevation) directly, which take into account atmospheric refraction. Along with pre-positioning the motors for the next day, I can now power down the sun finding circuit. Keeping the sun finder circuit powered off till …

When I use this code: double sunrise; // Sunrise, in hours (UTC) double transit; // Solar noon, in hours (UTC) double sunset; // Sunset, in hours (UTC) double dawn; // Civil dawn, in hours (UTC) double dusk; // Civil dusk, in hours (UTC) const float time_zone = -7.0f; void fSolarCalcul…

I think you're adding the time zone twice. In SolarTimeFormat, it should be: temp = String(hours) + ":" + String(minutes);

Thanks for pointing out that error.

That sounds like a very useful development. I had a quick look at the Sunrise/Sunset example and it seams very compact. A couple of years ago I built a 7-day time switch (actually I have now 4 to the same ESP8266 design) which allows the user, as well as being able to enter a normal time, say 08:15…

I take it that Jan is month 0 and Dec is month 11 with this library?

Months are 1-12. Same as the date (in 24h format) and compatible with the Time library for Arduino: hour(); // The hour now (0-23) minute(); // The minute now (0-59) second(); // The second now (0-59) day(); // The day now (1-31) month(); // The month now (1-12) year(); // The full four digit year…

I ended up with: void fSolarCalculations ( ) { // Location double latitude = 43.618881; double longitude = -116.215019; // Calculate the times of sunrise, transit and sunset (UTC) calcSunriseSunset( rtc.getYear(), rtc.getMonth() , rtc.getDay(), latitude, longitude, transit, sunrise, sunse…

The correct times are: > Date: 2021-12-6 > Latitude: 43.619 Longitude: -116.215 > UTC offset: -7 > -- > Sunrise: 08:04 > Transit: 12:36 > Sunset: 17:08 > Civil dawn: 07:31 > Civil dusk: 17:41 Arduino IDE 1.8.13 and Uno What did you get?

SolarCalculator library for Arduino

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jpb10 February 9, 2022, 12:07am 19

Latest version 1.0.2 should show up in the library manager any time and is significantly more lightweight after the removal of superfluous delta T equations.

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SolarCalculator library for Arduino

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