TPoint Pointing Terms
Here are some graphs of a grid of stars on a ten degree pitch
with 100 arc-seconds of the the more common pointing terms in
an equatorial telescopes.
The Graphs are the standard E9 format of TPoint.
ID Declination Dial Error
Δ δ = + ID
IH Hour Angle Dial Error
Δ h = +IH
MA Polar Axis Azimuth Error
Δ h = -MA cos h tan δ
Δ δ ≅ + MA sin h
ME Polar Axis Elevation Error
Δ h = +ME sin h tan δ
Δ δ ≅ + ME cos h
CH EW Collimation Error
Δ h ≅ + CH sec δ
FO Declination Fork Flexure
Δ δ = + FO cos h
NP HA/Dec non perpendicularity
Δ h ≅ + NP tan δ
