Eclipses - Solar Eclipses
Approximately by 30 in 30 days the Moon turns her obscured face to Earth as New Moon (see Moon Section – Moon's Phases). At that time, an observer at the North Pole of the ecliptic will see the Sun, the Moon and the Earth aligned in a straight line, but in spite of that the Moon's shadow almost never touches the Earth (due to her orbit).
The Moon cross the ecliptic only in two days each month, but if these dates coincide with New Moons, the Sun, The Moon and the Earth will be align, witch originate the projection of the Moon over somewhere in the Earth.
If the plane of the Moon's orbit stayed fixed in the space, the Solar Eclipses will occur always in two specific months, but due the regression of the nodes line of moon's orbit, the date of the eclipses will change more or less three weeks per year,
A complete regression of these nodes it's concluded in 18.6 years and that will influence the Eclipses dates.
This chapter due to his extension, are divided in the following sub-chapters:
Geometry of the Solar Eclipses;