A real session spans the hours of darkness. You pick a target, slew and plate-solve onto it, engage tracking and guiding, and capture a long sequence of sub-exposures. As the target crosses the meridian (its highest point), a GEM must perform a meridian flip to avoid hitting the tripod. Plan so the target transits near the middle of the night for the best altitude (least atmosphere). Sequencer software (NINA, Voyager, SGPro) runs the whole thing autonomously: GoTo → plate solve → autofocus → capture → flip → repeat. More subs = better SNR.