I would like to get information how to calculate efemerids for Nautical almanac (GHA of Aries, Sun, planets, Moon, Declination for Sun, Moon, planets, stars, GHA of stars, HP of Moon Mer. Pass.). I have some of the formulas but I would like to have them all in order to calculate efemerids. I know that there are some books on this subject but I would be grateful if someone could give me an abstract.