Find the sundial’s gnomon or shadow-casting part
Make sure the sundial is set for the correct location and orientation
Check that the sundial is level and aligned properly
Locate the shadow tip on the hour markings
Read the time indicated by the shadow position
Adjust for daylight saving time if applicable
Adjust for the local time zone if needed
Use the date or seasonal scale if the sundial has one
Compare the reading with a clock if you want to estimate accuracy