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I'm lazy and sometimes am not inclined to work with paper-and-pencil so I use this spreadsheet;

Sunsight reduction spreadsheet

I put the program on my cheapy tablet and get Ho, Hc, Zn and Int. fast.

It can be used to determine any needed figures for the Sun.

Such as;

-Sunrise (UTC)

-Sunset
-MP

Very handy.

Lou