Tpoint Formulas

Here I describe the formulas that are related to the pointing model implemented
in `schierd` for the ROTSE-III telescope. This is for quick reference only,
and details can be found in the Tpoint manual.

`ID`Index Error in DeclinationDeclination index error in an equatorial mount: the zero-point in .

`IH`Index Error in Hour AngleHour angle index error in an equatorial mount: the zero-point of .

`NP`HA/Dec Non-perpendicularityIn an equatorial mount, if the polar axis and declination axis are not exactly at right angles, east-west shifts of the image occur that are proportional to .

`CH`East-West Collimation ErrorIn an equatorial mount, the collimation error is the non-perpendicularity between the nominated pointing direction and the declination axis. It produces an east-west shift that is constant for all declinations.

`ME`Polar Axis Misalignment in ElevationVertical misalignment of the polar axis of an equatorial mount: a rotation about an east-west axis equal to coefficient

`ME`.`MA`Polar Axis Misalignment in AzimuthMisalignment of the polar axis of an equatorial mount to the left or right of the true pole: a rotation about an axis through ( ) equal to coefficient

`MA`.