A solar eclipse is most likely to occur when

In this scenario, the Sun would be blocking the view of the Moon from Earth, not the other way around. This arrangement corresponds to a lunar eclipse, where the Earth is positioned between the Sun and the Moon, preventing sunlight from illuminating the Moon.

This arrangement describes a lunar eclipse, where the Earth obstructs sunlight from reaching the Moon. While this is an essential celestial event, it does not result in a solar eclipse, which specifically requires the Moon to be positioned between the Earth and the Sun.

When the Earth, Sun, and Moon form a right angle, the alignment is not conducive to a solar eclipse. Instead, this configuration results in a neap tide, as the gravitational forces of the Sun and Moon are balanced, but it does not facilitate the Moon's shadow falling on the Earth.