31. Of course, the equation of time can still be used, when required, to obtain apparent solar time from clock time. 32. This is the equation of the pendulum, also called the equation of time , the table is added shortly before 1750. 33. As the plaque indicates with an additional correction, the equation of time table does not correct for daylight saving time. 34. In about 1763 he devised a precision sundial, or " heliochronometer " that incorporated the correction for the equation of time . 35. Many of them also display mean time and the equation of time , but the user does not have to perform addition. 36. This event may occur up to 16 minutes before or after noon GMT, a discrepancy calculated by the equation of time . 37. There are relatively minor inaccuracies due to the difference between local time and zone time, and due to the equation of time . 38. The tracker contains a mechanism that takes account of the equation of time and makes the tracker move according to sundial time. 39. On other nearby dates the only thing different is the equation of time , so this remains a reasonable estimate for a considerable period. 40. Many sundials, therefore, have tables or graphs of the equation of time engraved on them to allow the user to make this correction.
