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- TL;DR Summary
- Help to find positional astronomy formulas

Hi,

I'm developing a C++ computer library with the formulas in the book "Practical Astronomy with your Calculator or Spreadsheet, 4th edition" but I have a problem with the formula 49, "Sunrise and sunset": I don't get the same results than in the book.

I've been searching to find online calculator to check if the book is wrong or I am wrong. I've found some but I can't get any conclusion because each of them returns a different value; i.e, if I have tried three, I get three different values for sunset and sunrise.

So, I have searched to find the formulas that these online calculator uses without success. I've been searching for the formulas adopted by the IUA but, again, without success.

Where can I find those formulas? or How can I know if I'm getting a good results?

Thanks.

I'm developing a C++ computer library with the formulas in the book "Practical Astronomy with your Calculator or Spreadsheet, 4th edition" but I have a problem with the formula 49, "Sunrise and sunset": I don't get the same results than in the book.

I've been searching to find online calculator to check if the book is wrong or I am wrong. I've found some but I can't get any conclusion because each of them returns a different value; i.e, if I have tried three, I get three different values for sunset and sunrise.

So, I have searched to find the formulas that these online calculator uses without success. I've been searching for the formulas adopted by the IUA but, again, without success.

Where can I find those formulas? or How can I know if I'm getting a good results?

Thanks.