Chandrashtamam is the 8th raasi from our raasi. The days on which it occurs are calculated as Chandrashtamam days. We do not need to give much importance to this. We need to have an understanding that during these days, our efforts might not result in the desired outcome. Other than this, nothing much to do.
We can continue to do our daily austerities. Muhurtham will not be arranged on Chandrashtamam days – for example, for the one who is about to get married, the marriage ceremonies will not be arranged on the day of his or her Chandrashtamam. This is as per Jyotisha Shastram. Chandashtamam will not affect the performance of daily duties, austerities, and utsavams.