An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

The apparent magnitude of a star as determined by measuring its brightness on a photographic plate. The photographic magnitude scale is now considered obsolete.

Adj. of → photography; → magnitude.

Recording a large area of the night sky by photographic techniques, as practiced in the past before the advent of electronic detectors.

Adj. of → photography; → survey.

The process of recording and producing images by exposing light-sensitive detectors to light or other forms of radiation.

→ photo-, → -graphy.

Aksbardâri, literally "taking photograph," from aks, → photograph, + bardâri verbal noun of bardâštan "to take," composite verb from bar- "on; up; upon; in; into; at; forth; with; near; before; according to" (Mid.Pers. abar; O.Pers. upariy "above; over, upon, according to;" Av. upairi "above, over," upairi.zəma- "located above the earth;" cf. Gk. hyper- "over, above;" L. super-; O.H.G. ubir "over;" PIE base *uper "over") + dâštan "to have, to possess" (Mid.Pers. dâštan; O.Pers./Av. root dar- "to hold, keep back, maintain, keep in mind;" cf. Skt. dhr-, dharma- "law;" Gk. thronos "elevated seat, throne;" L. firmus "firm, stable;" Lith. daryti "to make;" PIE *dher- "to hold, support").
Šidnegâri, nurnegâri, action noun from šidnegâr, nurnegâr, → photograph.

The process of producing an image on a sensitive surface by radiation such as X-rays or gamma rays passing through an object.

→ radio + → -graphy.

In → graph theory, a → graph that has one of its → vertices, called the → root, distinguished from the others.

→ root; → graph.

An instrument that detects, magnifies, and records → seismic waves, especially those caused by → earthquakes or → explosions.

→ seismo-; → -graph.

Topographic description and charting of the surface of the Moon.

From seleno- combining form of Gk. selene "moon" + → -graphy.

Mâh-negâri, from mâh, → moon + negâri, → -graphy.

The number of → edges.

→ size; → graph.

A type of spectrograph that uses a slit to provide resolution.

→ slit; → spectrograp.

An instrument that disperses the light into spectral lines and records them.

→ spectro-; → -graph.

An instrument for recording monochromatic images of the Sun.

→ spectro-; → heliograph.

Of, relating to, or being a delineation of the form of a solid body on a plane.

→ stereography; → -ic

A graphical method of depicting three-dimensional geometrical objects in two dimensions. In a → planispheric astrolabe, it is the projection of a point of the celestial sphere onto the equatorial plane, as seen from one of the poles. The center of projection is the South pole for the northern hemisphere, and the North pole for the southern hemisphere. In this operation the projection of any circle of the sphere remains a circle on the projection plane and moreover the projection does not alter angles.

→ stereographic; → projection

The process or art of depicting solid objects on a plane surface.

→ stereo- + → -graphy

Of, relating to, or determined by → stratigraphy.

→ stratum; → -graphic.

The study of → sedimentary rock units, including their geographic extent, age, classification, characteristics and formation.

→ stratum; → -graphy; → -logy.

Any of several techniques, such as → Doppler tomography, for constructing a spatial distribution of physical quantity given measurements that are essentially line-integrals ("projections") through the distribution. Most famously, in medical tomography, the absorption of X-rays by a specimen is directly related to the line integral to make detailed images of a predetermined plane section of a solid object while blurring out the images of other planes.

From Gk. tomo- combining form of tomos "a cut, section, slice" tome "cutting" + → -graphy.

Borešnegâri, from boreš "section, slice, cutting," from boridan "to cut" (Mid.Pers. britan, brinitan "to cut off;" Av. brī- "to shave, shear," brin-; cf. Skt. bhrī- "to hurt, injure," bhrinanti "they hurt") + -negâri, → -graphy.