fiducial axis — The line joining opposite fiducial marks on a photograph. A fiducial mark is any marker built into an aerial camera that registers its image on an aerial photograph as a fixed reference mark. The image cast on a photograph by such a marker is… … Aviation dictionary
collimating marks — Index marks at the center point of each side of an air negative or photo. These are usually four in number, are rigidly connected with the camera lens through the camera body which forms images on the negative and usually define the principal… … Aviation dictionary
Fiduciary marker — A fiduciary marker or fiducial is an object used in the field of view of an imaging system which appears in the image produced, for use as a point of reference or a measure. It may be either something placed into or on the imaging subject, or a… … Wikipedia
principal point — As it relates to photography, it is the foot of the perpendicular to the photo plane through the perspective center. Generally, it is determined by the intersection of the lines joining opposite or diagonal collimating or fiducial marks. See also … Aviation dictionary
camera calibration — The determination of the calibrated focal length, the location of the principal point with respect to the fiducial marks and the lens distortion effective in the focal plane of the camera referred to the particular calibrated focal length … Military dictionary
Astrological age — For the song, see Aquarius/Let the Sunshine In. For the album, see The Age of Aquarius (album). An astrological age is a time period in astrology which is believed by some to parallel major changes in the Earth s inhabitants development,… … Wikipedia
Radiation therapy — Radiation (medicine) redirects here. It is not to be confused with Radiation (pain) or Radiology. Radiation therapy Intervention ICD 10 PCS D ICD 9 CM … Wikipedia
Time — This article is about the measurement. For the magazine, see Time (magazine). For other uses, see Time (disambiguation). The flow of sand in an hourglass can be used to keep track of elapsed time. It also concretely represents the present as… … Wikipedia
