moving shadows

I need to observe how shadows move on my 3d drawing.

I'd like to save each (movie) frame as a bmp.

At the moment, I change the time on the sun calculator.

For example, If I want to see the shadow movement for one hour, I will render to a file 60 times. Each time, I will change the sun angle calculator time by one minute.

How to I make a program that will

change the sun angle calculator,

pause for input on the time

save the render

pause for me to input the name of the render

That's all I want because the fancier that I get, the more I require help from this forum and the less that I learn about writing.

When I understand how this one works, I'll make a fancier one that will do more.