jmc

The days of the week repeat every $7$ days. So days $1,1+7,1+14,\dots$ are all on Mondays. Since day $22=1+21$ is a Monday, the twenty-third day is a $\boxed{\text{Tuesday}}$. In other words, if the remainder when $n$ is divided by $7$ is $1$, the $n$th day is a Monday. The remainder when $23$ is divided by $7$ is $2$, so the day is one day after Monday. That's Tuesday.