Not co-incidentally, the proper sidereal solar months (~ Indian solar calendar) also have two new-moons. This is considered a special enough occasion to warran

Not co-incidentally, the proper sidereal solar months (~ Indian solar calendar) also have two new-moons. This is considered a special enough occasion to warrant another month on the lunar calendar. I half-kid ofc. (in India, everything is 'divinized', and filled with wonder); this is actually a synchronization mechanism for the Indian luni-solar.