Let's imagine a planet which has sun and moon whose apparent size is same, just like in Earth.
If the lengths of the year, month and day on the planet were same, then the planet would always turn same side to the Sun. Moreover, if the moon was all the time between sun and the planet, then in the center of the light side there would be eternal solar eclipse. The climate of this area would be cold, so it would come some kind of third pole of the planet.
Is borning of that kind of planet (same year, month and day) in practice possible.
Another question: what kind of combination of year, month and day there should be, that in some area of the planet there would be eternal solar eclipse in the day, but also normal night so that sun would rise and set moon all the time in front of it.