I'm new to the study of Astronomy. I've never had an interest until recently. I'm into gardening and want to use the various aspects of the moon. I have searched and found most aspects (phases, apogee, etc) but the one which I can't find is the Lunar Nodal crossings. Those are the times (twice each month) when the moon crosses the Sun's ecliptic path going north and also going south. I'm looking for a chart or if not too difficult to calculate, the formula to calculate that with a good example that I can follow. Any info or leads along these lines would be appreciated. Thank you.