The topic of controlling scan timing is discussed in detail in the Scan Times section.
START is used to specify the start time of the scan in UT. If LST was specified, START is assumed to be in local sidereal time. START must be specified for the first scan. For later scans, it will default to the stop time of the previous scan if not specified. Note that the start time will be adjusted by PRESCAN to the time that the recording starts.