Problem with sunset calculation: I don't get the right time

[MBenoli]

Hello!

First of all, thank you for this great library!

Unfortunately, I have a problem when calculating sunset hours.

Here is an example to illustrate my problem: If I go on: http://www.suncalc.net The sunset hour for today in Brussels is 21h37. When I use the JavaScript Library Downloaded on GitHub, I obtain 21h40. Why this difference between the two results?

Thank you!

Michael.

[mourner]

Can you provide specific latitude, longitude, date and expected result?

[MBenoli]

Sure!

I use: lat=50.85, long=4.35, date=23/05/2014, expected result 21h37 for sunset.

Thanks!

[mourner]

The following code

console.log(SunCalc.getTimes(new Date('2014-05-23'), 50.85, 4.35).sunset);

returns Fri May 23 2014 22:36:58 GMT+0300 (EEST), which is 21h37 in your timezone. So I can't reproduce your issue.

[MBenoli]

Thank you for your answer!

I've just found the problem. It has nothing to do with the SunCalc algorithm. Sorry for the inconvenience.

[mourner]

Thanks! What was the problem?

[MBenoli]

I've just started using Titanium to build mobile applications. The problem is linked to the Date object. When I try the code with Firebug it works perfectly, but when I run it with Titanium it doesn't work. The date object doesn't return a valid date. I just figured out how to fix it but I still wonder why there is such a problem. I have my ideas but still... If I may benefit from this message to ask you another question. I would like to ask you if it is possible to use SunCalc to get the hour for a specific day of the year knowing the elevation angle? For example: At which hour the sun will have an elevation angle of -8.5 degrees in Belgium on the 24/05/2014. Result expected is 22h44. I just ask in the case you may be able to give me a quick answer otherwise I will work on it to figure it out. Thank you very much!

[mourner]

Yeah, check out SunCalc.addTime method in the docs.

[MBenoli]

Thanks! I'll take a look ;)