TPoint is computer software that implements a mathematical model of conditions leading to errors in telescope pointing and tracking.
The model can then be used in a telescope control system to correct the pointing and tracking.
For example, TPoint can analyze and compensate for systematic errors such as polar misalignment, mechanical and optical non-orthogonality, lack of roundness in telescope mounting drive gears, as well as for flexure of the mounting caused by gravity.
[1] It grew out of work he and John Straede performed at the Anglo-Australian Telescope (AAT) between 1974 and 1980 using Interdata 70 computers.
In the early 1980s, it was ported to the Digital Equipment Corporation VAX running under the VMS operating system and between 1990 and 1992 was also ported to run on the PC/MS-DOS platform as well as various UNIX platforms.