astronomy – Tarik Billa

Moon / Lunar Phase Algorithm

June 7, 2023 by Tarik

If you’re like me, you try to be a careful programmer. So it makes you nervous when you see random code scattered across the internet that purports to solve a complex astronomical problem, but doesn’t explain why the solution is correct. You believe that there must be authoritative sources such as books which contain careful, … Read more

Position of the sun given time of day, latitude and longitude

January 26, 2023 by Tarik

This seems like an important topic, so I’ve posted a longer than typical answer: if this algorithm is to be used by others in the future, I think it’s important that it be accompanied by references to the literature from which it has been derived. The short answer As you’ve noted, your posted code does … Read more