Something interesting about the Jewish month of Adar: In some years there is one Adar, while in leap years, there are two consecutive Adars. This raises the question: In which Adar is Purim celebrated in leap years? The answer is: in the Adar that immediately precedes the month of Nissan, and not the earlier Adar. This is in order that Purim can be commemorated as close to Pesah as possible.
The reason this is so important has to do with the inherent link between the Redemption of Purim and that of Pesah.
Rabbi Tzvi Yehuda Kook served as Head of the Merkaz HaRav Yeshiva for thirty years. During these years, an entire generation of students was nurtured upon a philosophy which combined the Torah of Israel, the nation of Israel, and the land of Israel.