Preheat oven to 300 degrees F (150 degrees C).Set rack in the middle of the oven.Butter and flour a 9 1/2 inch springform pan, and tap out excess flour.

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Place the ricotta in a large mixing bowl, and stir it as smooth as possible with a rubber spatula.Stir the sugar and flour together thoroughly into the ricotta.Stir in the eggs 1 at a time.Blend in the vanilla, cinnamon, orange zest, and salt.Pour batter into the prepared pan.

Bake in the center of the oven for about 1 1/4 to 1 1/2 hours, until a light golden color.Make sure the center is fairly firm, and the point of a sharp knife inserted in the center comes out clean.Cool on a wire rack.It will sink slightly as it cools.Cover, and chill till serving time.