The technical term for the crosshairs that appear in photographs taken on the lunar surface These are part of a reseau grid that can be used for photogrammetric analysis
based on trust used as a fixed standard of reference for comparison or measurement; "a fiducial point
Fiducial sites are fixed GPS receivers on the ground, against which data from the satellite can be differenced GPS/MET uses data from six sites which take measurements once per second
used as a fixed standard of reference for comparison or measurement; "a fiducial point"
A mark or identifier, which, in the case of roll-to-roll screen printing or die cutting on PRECO equipment is used to determine an exact reference location to the image to be treated A typical fiducial, or pair of fiducials for x-y-Ø register is picked up by sensors that determine where the marks are, in regard to where they should be after a correcting movement takes place This movement may be either the substrate, or the screen frame or cutting tool Most often the sensors are either fiber optic, or CCD (charge couple device) camera vision optics
relating to or of the nature of a legal trust (i e the holding of something in trust for another); "a fiduciary contract"; "in a fiduciary capacity"; "fiducial power"
The various Hasselblad cameras had a plate next to the film that superimposed references marks (crosses) on the film In the text, the location of an object in an image is sometimes indicated by reference to the crosses= fiducials Details linked here