“molad is not an astronomical observation, but simply adding a fixed average lunar month time that may be hours off a “real” rosh chodesh.
On that note, is it necessary to announce a rosh chodesh (or to go to listen to it), as everyone is going to see it and reminded multiple times before that by the media?“
My quip of Rosh Chodesh wasn’t to you it was to Modern who said “We recite Hallel on the days of solar eclipses.“