It will not prove effective to project forward these 15 degree movements infinitely. They are most effective when another cycle lands on or very near the same date. There are times when they align for many successive measurements. Then they slowly come in farther and farther away from each other as the cycles differing lengths cause them to get out of phase.
One of the most important timing technique is to learn how the smaller cycles "fit" inside the larger ones. They approximate the movements of the larger ones and help to narrow the window of tolerance. the faster moving planets are Mercury (88days) venus (225 days), earth and the link between the smaller and larger planets is mars (687 days).