1. Taking the latitude of Dublin as 53.3 degrees North, and the tilt of the Earth's axis and the lunar orbit to be 23.5 and 5 degrees respectively, what is the maximum altitude of the Moon as seen from Dublin? What is the maximum altitude as seen from the North pole? 2. Relevant equations, well that's my main question about the question, as such. Are there a few formula that are generally used in basic astrophysics, like there are the equations of motion and kinetic/potential energy, et cetera for mechanics? Not only for like the question posted above, but also for other areas of astronomy, like birghtness of stars, and such? The text books I've looked at have had lovely long english-y paragraphs about the sun and whatnot, but I'm not sure where to find a more physics approach to the topic. 3. Thanks.