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

A range of frequencies that can pass through a filter such as one in an electrical circuit.

From → band + pass, from O.Fr. passer, from V.L. *passare "to step, walk, pass," from L. passus "step, pace;" cf. Pers. pâ "foot," pey "step."

Gozar-bând, from gozar "passage, transit, passing," gozaštan "to pass, cross, transit," from Mid.Pers. vitârtan + bând, → band.

An electric filter that transmits a known band of frequencies but suppresses unwanted frequencies above and below this band.

→ bandpass; → filter.

A device for determining directions, as by means of a freely rotating → magnetic needle that indicates → magnetic north.

M.E. compas, from O.Fr. compas "circle, pair of compasses," from compasser "to go around, measure," from V.L. *compassare "to pace out," from L. → com- "together" + passus "a step."

Qotbnemâ, literally "pole indicator," from qotb, → pole, + nemâ "indicator, showing," from nemudan "to show," → display.

The needle in a → magnetic compass.

→ compass; → needle.

An instrument that consists of two arms, joined at the top, one arm of which serves as a stationary reference point or pivot, while the other describes a circle or is extended. It is used for measuring angles, transferring lengths, and drawing circumferences. Also pair of compasses.

→ compass.

Pargâr "a pair of compasses," from Proto-Ir. *pari-kar- "to draw around, to plough around," from *pari- "around, round about" (Mod.Pers. par-, pirâ-, cognate with Gk. peri-), → circum-, + *kar-, karš- "to draw (a furrow), till, plant" (Mod.Pers. kašidan "to draw," kâštan, kâridan "to plant"); Lori, Hamadâni kerr "line, scratch;" Laki keronen, Hamadâni kerândan "to pull along, drag;" Tâleši kernye; Tabari kərəš "to drag;" cf. Av. pairikara- "a furrow round about," Skt. parikara- "girdle, waist-band, zone."

A type of → light pollution which is light falling where it is not wanted or needed. Light trespass occurs when poorly shielded or poorly aimed fixtures cast light into unwanted areas, such as buildings, neighboring property, and homes. This light is a main contributor to → skyglow which interferes with astronomical instruments.

→ light; → trespass.

→ compass.

→ magnetic; → compass.

The moment when a celestial object crosses an observer's meridian. Same as meridian transit.

→ meridian; → passage.

An act or instance of passing from one place, condition, etc., to another; transit. Same as → transit.

M.E, from O.Fr. passage, from passer "to go by;" originally "a road, passage."

Gozar "passage, transit, passing," from gozaštan "to pass, cross, transit," variant gozâštan "to put, to place, let, allow;" Mid.Pers. widardan, widâštan "to pass, to let pass (by);" O.Pers. vitar- "to pass across," viyatarayam "I put across;" Av. vi-tar- "to pass across," from vi- "apart, away from" (O.Pers. viy- "apart, away;" Av. vi- "apart, away;" cf. Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + O.Pers./Av. tar- "to cross over;" → trans-.

The range of wavelengths that are transmitted by a filter. Same as → band-pass.

Pass from O.Fr. passer, from V.L. *passare "to step, walk, pass," from L. passus "step, pace;" cf. Pers. pâ "foot," pey "step;" → band.

Gozar "passage, transit, passing," from gozaštan "to pass, cross, transit," variant gozâštan "to put, to place, let, allow;" Mid.Pers. widardan, widâštan "to pass, to let pass (by);" O.Pers. vitar- "to pass across," viyatarayam "I put across;" Av. vi-tar- "to pass across," from vi- "apart, away from" ( O.Pers. viy- "apart, away;" Av. vi- "apart, away;" cf. Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + O.Pers./Av. tar- "to cross over"); bând, → band.

Tending not to participate actively; not working or operating.

From L. passivus "submissive; capable of feeling or suffering," from passus, p.p. of pati "to experience, undergo, suffer."

Akâr "not working, not doing," from → a- negation prefix + kâr "work," varaint of kar, present stem of kardan "to do, to make" (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base k^wer- "to do, to make").

A cumulus cloud that is no longer dynamically connected with the atmospheric boundary layer via updrafts or downdrafts.

→ passive; → cloud.

An electronic component which contains no source of power, in contrast to active components.

→ passive; → component.

A galaxy lacking optical emission-line activity (e.g., [O II], Hα, [O III]) and showing only stellar absorption lines (e.g., the 4000 Å → calcium break, Mg I, Na I). Also called passively evolving galaxy.

→ passive; → galaxy.

An electronic system which emits no energy, and is not detectable.

→ passive; → system.

Same as → passive galaxy.

→ passive; → evolve; → galaxy.

An arbitrary string of characters chosen by a user or system administrator and used to authenticate the user when he attempts to log on, in order to prevent unauthorised access to his account (foldoc.org).

Pass, → passage; → word.

One of the → orbital elements, the time when the → secondary body reaches → periapsis.

→ time; → periapsis; → passage.

1) Law: An unlawful act causing injury to the person, property, or rights of another, committed with force or violence, actual or implied. → light trespass.
2) To commit a transgression or offense; transgress; offend; sin (Dictionary.com).

M.E. trespas, from O.Fr. trespasser "pass beyond or across, cross, traverse; infringe, violate," from tres- "beyond," from L. → trans-, + passer "go by, pass," → pass, → passage.

Tarâraft, tarâraftan, from tarâ-, → trans-, + raft, raftan "to go," → process.