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\subsubsection{In-class exercises}  Rather than lecture at students during the 110 min lab period, short in-class exercises are used to refresh and deepen understanding of concepts introduced in the lecture portion of the course. These in-class exercises are meant to stimulate discussion and questions in lab groups. Instructors circulate around the room and answer these questions as they arise. After 20--30 minutes, students must write down their conclusions and turn their in-class exercises in. These in-class exercises only compose a tiny portion of the grade and are only assessed for effort, but this assessment ensures students engage with the material.  \subsubsection{Lab assignments}  \subsubsection{Hands-on observing experience} 
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\subsubsection{Assessment}  Spectrograph at observatory  Increased instructor time enabling more observing.  Using telescopes on roof.