Birkat Levana with Clouds

Hello Rabbi, I have a couple of questions about Birkat Levana: If one clearly sees the new moon and 10 seconds later it becomes obscured by clouds, may they still proceed with the berakha? In another instance, if the clouds are not too opaque and one can still make...

Uvadin DeChol

Hello Rabbi, What is the halakhic definition of Uvadin DeChol and how does one determine if it falls into this category? I find that a lot of people in positions of authority cite this as a catchall reason for prohibiting things on Shabbat rather than performing an...