How to calculate sunrise, sunset and noon

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I'm trying to make a program that calculates the sunrise, sunset and solar noon based on longitude, latitude and time zone for any city in the world.

How can I do that in vb.net?

Thanks.

Posted 4-Jun-15 6:07am

al3abby

Updated 4-Jun-15 6:33am

v2

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Richard Deeming · Accepted Answer · 2015-06-04T06:28:00

Solution 1

The calculations for sunrise and sunset are easy to find:
https://en.wikipedia.org/wiki/Sunrise_equation[^]
http://users.electromagnetic.net/bu/astro/sunrise-set.php[^]
http://aa.quae.nl/en/reken/zonpositie.html[^]

You just need to translate the calculation into code.

There's no need to "calculate" noon - it's always at exactly 12 PM. :)
(Unless you mean "solar noon", which is included in the sunrise / sunset calculation.)

EDIT: I've posted the C# code I use to GitHub, which might give you a place to start:
https://gist.github.com/RichardD2/f6b08a5791b21ac77ce7[^]

Posted 4-Jun-15 6:28am

Richard Deeming

Updated 4-Jun-15 8:01am

v2

Comments

al3abby 4-Jun-15 12:36pm

If I knew how to translate the calculation into code, I wouldn't have asked!

Richard Deeming 4-Jun-15 12:40pm

So you're expecting someone else to do your work for you?

al3abby 4-Jun-15 13:04pm

No, i'm expecting some guidance.

Richard Deeming 4-Jun-15 13:08pm

The guidance is:
1. Read the details of the calculation, which gives you step-by-step instructions on how to calculate the sunrise, sunset and solar noon times by hand;
2. Convert each manual step to equivalent code;
3. There is no step 3.

If you get stuck with converting a particular step to code, then feel free to ask for help.

al3abby 4-Jun-15 13:31pm

thank you, you made it clear this time! But the thing is I was looking for someone to guide me on how to convert these equations (which I already know) to a code that vb.net can understand (as I'm still a beginner), so the things that might look obvious to you might seem a little bit difficult to some others. Anyway I'm taking my question somewhere else.

Richard Deeming 4-Jun-15 14:04pm

I've posted the C# code I use to GitHub:
https://gist.github.com/RichardD2/f6b08a5791b21ac77ce7[^]

That might give you a place to start - the main calculation is in the CalculateCore method.

al3abby 4-Jun-15 14:17pm

Thank you very much, I'll start working on that

Sergey Alexandrovich Kryukov 4-Jun-15 17:31pm

Sure, a 5.
—SA