C program calculating the sunrise and sunset

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Sunrise and sunset times based on coordinates and altitude Ask Question. Asked 9 years, 7 months ago. Active 5 years, 10 months ago. Viewed 3k times. I am using this code for calculating sunrise and sunset times. Improve this question. Kamrul Kamrul 2 2 silver badges 8 8 bronze badges.

Stack Overflow is not going to read all of that. Anonymous Jun Ezel3 Nov KSharenkov Jan Tutankhamen 2-Jul Go to top. Layout: fixed fluid. Software Developer Birdsoft. United States. First Prev Next. Some cleanup suggestions J Haycox May The code works pretty good as is for US cities provided you pass West longitude as a positive value an unexpected convention. You could modify the code to invert longitude if the more common convention of negative for west longitude is desired.

However the code to convert to local time has some flaws. GetYear ,time. GetMonth ,time. GetDay , tog. GetHour , tog. GetMinute , tog. GetSecond ; return NewTime; In testing remember to pass West longitude as positive and East as negative or change the code to follow the more common convention. Also remember that times are local times for the timezone set for the computer running the code not the target location.

Member Great stuff is there a fix for DST? Robert Valentino. Hello: Tried your demo and really cool stuff, thanks so much for posting this code. Thanks, guys. This product is only targeted for North America at this moment. We'll also support automatic DST adjustment, which by itself might be another unique challenge if the product goes global.

It takes approx. The calculation takes instruction cycles. At 4MHz Xtal, it is equivalent to I would be more than a little cautious about throwing away accuracy without a fuller analysis.

Nearest whole degree is easy to explain and implement. I assume they just picked several lines assuming the error was not to bad. Ian I have mentioned these values as rough estimation for positions not far away from equator and will check and compare the codes in links which are given in post 8 and 9 for different regions of earth.

I am working on the example codes. Regards Edit : Sorry , it is not cos H but cosH as the name of the variable which has been calculated. Latest Posts. PIC pin input current. Install Sunwait on Raspberry Pi. Sunwait is a program for calculating sunrise and sunset Sunwait is a small C program for calculating sunrise and sunset, as well as civil, nautical, and astronomical twilights.

You should specify the latitude and longitude of your target location. Target date. Only useful with major-options: 'report' or 'list'. Show more. Enable snaps on Raspberry Pi and install Sunwait Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build.

You will also need to reboot your device:. After this, install the core snap in order to get the latest snapd:. To install Sunwait, simply use the following command:. Other popular snaps… See more See more in Featured.