Question

hat conditions are necessary for a partial solar eclipse? what conditions are necessary for a partial solar eclipse? first or third quarter moon at a node new moon on ecliptic, with us in the penumbral shadow full moon at apogee full moon on equator, with us in the umbral shadow new moon at perigee

Answer 1

An eclipse of the sun must occur at a "new" moon - when the moon is between the earth and the sun.

The word penumbra refers to a "partial" eclipse as opposed to umbra which refers to total eclipse.

A partial eclipse must include both terms - "new" and "penumbra"