Rosh Chodesh Nissan On A Sunday

If the first of Nissan falls on a Sunday, the first day of the Jewish week, then it is precisely like the first Rosh Chodesh Nissan from which all of the goodness and blessing for all the years are derived - for the Rosh Chodesh Nissan on which the Mishkan was dedicated also fell on a Sunday.

(Rabbi Eliyahu Kitov)