declinationn.

/dɛklɪˈneɪʃən/

Etymology: < Old French déclinacion, < Latin dēclīnātiōn-em , noun of action < dēclīnāre to decline v. In some senses perhaps a direct adaptation of the Latin word.

The action of declining.

†1. A turning aside, swerving, deviation from a standard; turning aside (from rectitude, etc.); falling away; = declension n. 2. Obsolete.

ΘΚΠ

society > morality > moral evil > moral or spiritual degeneration > [noun]

degeneration?1481

declining1526

declination1533

depravation1561

villainy1564

declension1597

depravedness1623

decadency1632

degenerateness1640

depravity1643

depravement1645

degradation1663

degeneracy1664

degenerousness1678

marasmus1681

debasednessa1720

decadencea1734

demoralization1797

downgrade1857

decadentism1949

the mind > goodness and badness > wrongdoing > undutifulness > dereliction of duty > [noun]

defaulta1250

fail1297

declining1526

defection1532

declination1533

defect1540

delinquishment1593

declension1597

secession1601

delinquency1606

delinquence1613

deliquity1682

dereliction1778

derelictness1888

the mind > will > decision > irresolution or vacillation > reversal of or forsaking one's will or purpose > [noun] > desertion of one's party or principles

recreandisea1425

declining1526

declination1533

back-turning1535

defect1540

revoltc1576

falling off1577

apostasy1578

tergiversation1583

declension1597

recreancy1602

starting1602

recreantness1611

recession1614

turncoating1624

recreancea1632

diffidation1640

withdrawment1640

tergiversating1654

turning1665

ratting1789

renegadism1823

turncoatery1841

defection1884

turncoatism1889

1533 T. More Answere Poysened Bk. Pref. sig. Aa.iii Declynacyon into foule and fylthy talkynge.

1605 F. Bacon Of Aduancem. Learning ii. sig. Ggg4^v The declinations from Religion.

1659 H. Hammond Paraphr. & Annot. Psalms (ci. 3 Paraphr.) 496 The least declination from the rules of justice.

1673 R. Allestree Ladies Calling i. §3. 24 The declinations to any vice are gradual.

1814 R. Southey Roderick x. 126 The slight bias of untoward chance Makes his best virtues from the even line, With fatal declination, swerve aside.

†2. An inclination or leaning (away from or towards anything); a mental bias. Obsolete.

ΘΚΠ

the mind > will > wish or inclination > [noun] > turn of mind, bent, or talent

spiritc1384

bend1591

incline1596

declinationa1605

verve1697

cast1711

affinity1832

flair1925

a1605 J. Stow Elizabeth I in Annales anno 1581 (R.) Letters..signefying the queen's declination from marriage, and the people's unwillingness to match that way.

1622 J. Donne Serm. to Hon. Company Virginian Plantation 15 Saint Augustine himselfe had at first some declinations towards that opinion.

3. A leaning, bending, or sloping downwards; slope, inclination from the vertical or horizontal position.

ΘΚΠ

the world > space > direction > [noun] > direction with respect to that of another > deviation from vertical or horizontal

declination1594

declension1640

inclination1799

1594 H. Plat Diuers Chimicall Concl. Distillation 16 in Jewell House Let it settle..then by declination poure away the cleerest.

1616 J. Bullokar Eng. Expositor Declination, a bending downeward.

1662 E. Stillingfleet Origines Sacræ iii. ii. §16 For this purpose he invented a motion of declination..he supposed..the descent not to be in a perpendicular right line, but to decline a little.

1692 R. Bentley Boyle Lect. ii. 34 This Declination of Atoms in their Descent, was it self either necessary or voluntary.

1816 W. Scott Antiquary I. xiii. 280 A declination of the Antiquary's stiff backbone acknowledged the preference.

1846 J. Joyce Sci. Dialogues x. 23 A small declination..would throw the line of direction out of the base.

†4. A sinking into a lower position; descent towards setting; = declining n. 4. Obsolete.

ΘΚΠ

the world > the universe > heavenly body > movement of heavenly bodies > [noun] > set

setc1386

descensiona1398

settinga1400

resconsing1503

declination?1504

fall1549

retreat1601

obit1656

?1504 S. Hawes Example of Vertu sig. aa.iiii In Septembre in fallynge of the lefe Whan phebus made his declynacyon.

1630 J. Taylor Trav. in Wks. iii. 84/2 Beeing a man famous through Europe, Asia, Affricke, and America, from the Orientall exhaltation of Titan, to his Occidental declination.

†5. The gradual falling off from a condition of prosperity or vigour; decline; decay. Obsolete.

ΘΚΠ

the world > action or operation > adversity > [noun] > fall from prosperous or thriving condition

rureOE

ebbingc1200

fallc1225

declinea1327

downfallingc1330

downfalla1400

fall of mana1400

wanea1400

ruinc1405

wrack1426

inclinationc1450

declination1533

labefactation1535

ebb1555

falling off1577

declining1581

inclining1590

declension1604

downset1608

neck-breaka1658

overseta1658

lapsing1665

reducement1667

lapse1680

labefaction1792

downshift1839

subsidence1839

downgrade1857

downturn1858

downslide1889

downswing1922

turn-down1957

tail-off1975

1533 T. More Apol. xviii, in Wks. 878/2 In this declinacion of the worlde.

1589 G. Puttenham Arte Eng. Poesie i. vi. 8 Then aboutes began the declination of the Romain Empire.

a1638 J. Mede Summ. View Apoc. in Wks. (1672) v. 923 His Declination and Ruine we see is already begun.

1673 H. Stubbe Further Iustification War against Netherlands 82 The declination of antient Learning.

1799 G. Washington Let. in Writings (1893) XIV. 191 Although I have abundant cause to be thankful for..good health..yet I am not insensible to my declination in other respects.

†6. The withholding of acceptance; non acceptance, modest or courteous refusal; declinature. ? Obsolete.

ΘΚΠ

the mind > language > statement > refusal > [noun] > courteous refusal

declining1607

declination1618

declinement1680

declension1817

declinal1837

declinature1850

1618 Bp. J. Hall Contempl. IV. O.T. xii. 96 A modest declination of that honor, which hee saw must come.

1634 Bp. J. Hall Contempl. Hist. New Test. (STC 12640.5) 153 A voluntarie declination of their familiar conversation.

1884 Pall Mall Gaz. 21 Aug. 5/1 [The author] must excuse our declination to accept as possible characters in any possible social system, people so unnatural.

7. Astronomy. The angular distance of a heavenly body (north or south) from the celestial equator, measured on a meridian passing through the body: corresponding to terrestrial latitude. Formerly also the angular distance from the ecliptic.

(The earliest and now most usual sense.) circle of declination or parallel of declination: see circle n. 2a, parallel n., adj., and adv.

ΘΚΠ

the world > the universe > heavenly body > position of heavenly body > [noun] > other

declinationc1400

meridian altitudec1400

angle of position?a1560

zenith distance1588

refraction1603

azimuth1626

amplitude1627

horizontal parallax1665

complement1703

aberration1737

hour-angle1837

intercept1901

c1400 ( G. Chaucer Treat. Astrolabe (Cambr. Dd.3.53) (1872) ii. §17. 28 Al be it so þat fro [the] Equinoxial may the declinacion or the latitude of any body celestial be rikned..riht so may the latitude or the declinacion of any body celestial, saue only of the sonne..be rekned fro the Ecliptik lyne.

c1400 ( G. Chaucer Treat. Astrolabe (Cambr. Dd.3.53) (1872) i. §17. 9 In this heued of cancer is the grettest declinacioun northward of the sonne.

c1405 (c1395) G. Chaucer Franklin's Tale (Hengwrt) (2003) l. 538 Phebus..That in his hote declynacioun Shoon as the burned gold w^t stremys brighte.

c1550 Complaynt Scotl. (1979) vi. 37 The mouyng eleuatione, and declinatione of the sone mune, and of the sternis.

1594 T. Blundeville Exercises ii. f. 53 The greatest declination which is 23. degrees, 2'8.

1794 R. J. Sulivan View of Nature I. 390 In consequence of the different declinations of the sun and moon at different times.

1814 J. Playfair Outl. Nat. Philos. II. i. i. 7 The arch of that circle intercepted between the star and the Equator, is called the Declination of the star.

1872 R. A. Proctor Ess. Astron. i. 2 To Herschel astronomy was not a matter of right ascension and declination.

8. Of the magnetic needle: †(a) (formerly) the dip n.³ or deviation from the horizontal (obsolete); (b) the deviation from the true north and south line, esp. the angular measure of this deviation; also called variation n.

ΘΚΠ

society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > compass > variation

north-easting1555

variation of the compass, (lodestone,) or needle?a1560

norwesting1561

north-westing1571

variation1595

declination1625

magnetic variation1696

variation of the variation1706

magnetic declination1787

1625 N. Carpenter Geogr. Delineated i. iii. 66 The Declination is a magnetical motion, whereby the magneticall needle converts it selfe vnder the Horizontall plaine, toward the Axis of the Earth.

1646 Sir T. Browne Pseudodoxia Epidemica ii. ii. 61 The Inclination or Declination of the Loadstone; that is, the descent of the needle below the plaine of the Horizon.

1865 D. Livingstone & C. Livingstone Narr. Exped. Zambesi vi. 133 Magnetical observations, for ascertaining the dip and declination of the needle.

1878 T. H. Huxley Physiography (ed. 2) i. 10 The divergence of the position of the magnetic needle from the true north-and-south line is called its declination, or by nautical men, its variation.

9. Dialling. Of a vertical plane (e.g. that of a wall): The angular measure of its deviation from the prime vertical (the vertical plane through the east and west points of the horizon), or from the meridian (that through the north and south points).

ΚΠ

1593 T. Fale Horologiographia f. 4 The East and West are not said to decline, because the declination is accounted from the south and North to the direct East and West points.

1669 S. Sturmy Mariners Mag. vii. vi. 11 The Declination of a Plane is the Azimuthal Distance of his Poles from the meridian.

1703 Moxon's Mech. Dyalling (ed. 4) in Moxon's Mech. Exercises (new ed.) 314 If it do not point directly either East, West, North, or South, then so many degrees is the Declination of the Plane.

1737–51 E. Chambers Cycl. Declination of a plane, or wall, in dialling.

†10. Grammar. = declension n. 4. Obsolete.

ΘΚΠ

the mind > language > linguistics > study of grammar > morphology > inflection > [noun] > declension

declinationc1440

declension1565–78

declining1565

obliquity1668

the mind > language > linguistics > study of grammar > morphology > inflection > [noun] > declension > a declension

declinationc1440

declension1569

c1440 J. Capgrave Life St. Katherine i. i. 259 To teche hir of retoryk and gramer the scole..The declynacions, þe personys, the modys, þe tens.

1530 J. Palsgrave Lesclarcissement Introd. 29 Pronownes of the fyrst declynation.

1603 J. Florio tr. M. de Montaigne Ess. i. xxv. 85 We did tosse our declinations, and conjugations to and fro.

1751 T. Smollett Peregrine Pickle I. xiii. 95 A perfect ignoramus, who scarce knows the declination of musa.

Compounds

C1. General attributive.

declination-needle n.

ΚΠ

1866 R. M. Ferguson Electricity 19 Instruments for determining magnetic declination are called declination needles or declinometers.

C2.

declination axis n. that axis of an equatorial telescope which is at right angles to the polar axis, and to which is attached at one end the telescope and at the other the declination circle, so called because when the position of the telescope is changed by turning the declination axis there is an alteration in the declination of the object viewed.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > parts of

well1706

declination axis1835

declination circle1835

telescope driver1874

adaptive optics1966

1835 Mechanics' Mag. 24 210/2 On these rollers turns the declination axis.

1888 Encycl. Brit. XXIII. 146/2 The equatorial in its simplest form consists of an axis parallel to the earth's axis, called the ‘polar axis’; a second axis, at right angles to this, called the ‘declination axis’; and a telescope fixed at right angles to the latter.

1905 Westm. Gaz. 17 Apr. 1/3 A large equatorial with a 26-in. photographic refractor at one end of the declination axis and a 30-in. reflector at the other.

1964 R. H. Baker Astron. (ed. 8) iv. 108 The circle on the declination axis is graduated in degrees of declination.

declination circle n. (a) (see quot. 1854); (b) the graduated circle on an equatorial telescope which marks the declinations of the heavenly bodies.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > parts of

well1706

declination axis1835

declination circle1835

telescope driver1874

adaptive optics1966

1835 Mechanics' Mag. 24 211 Y is the declination circle, fixed on the declination axis.

1854 H. Moseley Lect. Astron. (ed. 4) ix. 41 Declination-circles are those great circles which pass round the heavens from one pole to the other.

1888 Encycl. Brit. XXIII. 149/1 The declination circle is attached to the farther end of the declination axis.

declination compass n. (see quot.).

ΚΠ

1862 Chambers's Encycl. III. 461/1 The ordinary compass which must be used by making allowance for declination, is a declination compass.

declination magnet n. a magnet used in determining the magnetic declination and the magnetic axis.

ΚΠ

1883 Encycl. Brit. XV. 238/1 The first step is to remove the torsion as far as possible from the suspension fibre by hanging to it a brass plummet E of the same weight as the declination magnet. After this weight has come to rest, it is replaced by the declination magnet.

1899 Daily News 3 Mar. 5/2 They have placed out here a declination magnet, a dip instrument for the inclination of the needle, and a deflexion instrument.

This entry has not yet been fully updated (first published 1894; most recently modified version published online September 2021).

单词	declination
释义	declinationn. /dɛklɪˈneɪʃən/ Etymology: < Old French déclinacion, < Latin dēclīnātiōn-em , noun of action < dēclīnāre to decline v. In some senses perhaps a direct adaptation of the Latin word. The action of declining. †1. A turning aside, swerving, deviation from a standard; turning aside (from rectitude, etc.); falling away; = declension n. 2. Obsolete. ΘΚΠ society > morality > moral evil > moral or spiritual degeneration > [noun] degeneration?1481 declining1526 declination1533 depravation1561 villainy1564 declension1597 depravedness1623 decadency1632 degenerateness1640 depravity1643 depravement1645 degradation1663 degeneracy1664 degenerousness1678 marasmus1681 debasednessa1720 decadencea1734 demoralization1797 downgrade1857 decadentism1949 the mind > goodness and badness > wrongdoing > undutifulness > dereliction of duty > [noun] defaulta1250 fail1297 declining1526 defection1532 declination1533 defect1540 delinquishment1593 declension1597 secession1601 delinquency1606 delinquence1613 deliquity1682 dereliction1778 derelictness1888 the mind > will > decision > irresolution or vacillation > reversal of or forsaking one's will or purpose > [noun] > desertion of one's party or principles recreandisea1425 declining1526 declination1533 back-turning1535 defect1540 revoltc1576 falling off1577 apostasy1578 tergiversation1583 declension1597 recreancy1602 starting1602 recreantness1611 recession1614 turncoating1624 recreancea1632 diffidation1640 withdrawment1640 tergiversating1654 turning1665 ratting1789 renegadism1823 turncoatery1841 defection1884 turncoatism1889 1533 T. More Answere Poysened Bk. Pref. sig. Aa.iii Declynacyon into foule and fylthy talkynge. 1605 F. Bacon Of Aduancem. Learning ii. sig. Ggg4^v The declinations from Religion. View more context for this quotation 1659 H. Hammond Paraphr. & Annot. Psalms (ci. 3 Paraphr.) 496 The least declination from the rules of justice. 1673 R. Allestree Ladies Calling i. §3. 24 The declinations to any vice are gradual. 1814 R. Southey Roderick x. 126 The slight bias of untoward chance Makes his best virtues from the even line, With fatal declination, swerve aside. †2. An inclination or leaning (away from or towards anything); a mental bias. Obsolete. ΘΚΠ the mind > will > wish or inclination > [noun] > turn of mind, bent, or talent spiritc1384 bend1591 incline1596 declinationa1605 verve1697 cast1711 affinity1832 flair1925 a1605 J. Stow Elizabeth I in Annales anno 1581 (R.) Letters..signefying the queen's declination from marriage, and the people's unwillingness to match that way. 1622 J. Donne Serm. to Hon. Company Virginian Plantation 15 Saint Augustine himselfe had at first some declinations towards that opinion. 3. A leaning, bending, or sloping downwards; slope, inclination from the vertical or horizontal position. ΘΚΠ the world > space > direction > [noun] > direction with respect to that of another > deviation from vertical or horizontal declination1594 declension1640 inclination1799 1594 H. Plat Diuers Chimicall Concl. Distillation 16 in Jewell House Let it settle..then by declination poure away the cleerest. 1616 J. Bullokar Eng. Expositor Declination, a bending downeward. 1662 E. Stillingfleet Origines Sacræ iii. ii. §16 For this purpose he invented a motion of declination..he supposed..the descent not to be in a perpendicular right line, but to decline a little. 1692 R. Bentley Boyle Lect. ii. 34 This Declination of Atoms in their Descent, was it self either necessary or voluntary. 1816 W. Scott Antiquary I. xiii. 280 A declination of the Antiquary's stiff backbone acknowledged the preference. 1846 J. Joyce Sci. Dialogues x. 23 A small declination..would throw the line of direction out of the base. †4. A sinking into a lower position; descent towards setting; = declining n. 4. Obsolete. ΘΚΠ the world > the universe > heavenly body > movement of heavenly bodies > [noun] > set setc1386 descensiona1398 settinga1400 resconsing1503 declination?1504 fall1549 retreat1601 obit1656 ?1504 S. Hawes Example of Vertu sig. aa.iiii In Septembre in fallynge of the lefe Whan phebus made his declynacyon. 1630 J. Taylor Trav. in Wks. iii. 84/2 Beeing a man famous through Europe, Asia, Affricke, and America, from the Orientall exhaltation of Titan, to his Occidental declination. †5. The gradual falling off from a condition of prosperity or vigour; decline; decay. Obsolete. ΘΚΠ the world > action or operation > adversity > [noun] > fall from prosperous or thriving condition rureOE ebbingc1200 fallc1225 declinea1327 downfallingc1330 downfalla1400 fall of mana1400 wanea1400 ruinc1405 wrack1426 inclinationc1450 declination1533 labefactation1535 ebb1555 falling off1577 declining1581 inclining1590 declension1604 downset1608 neck-breaka1658 overseta1658 lapsing1665 reducement1667 lapse1680 labefaction1792 downshift1839 subsidence1839 downgrade1857 downturn1858 downslide1889 downswing1922 turn-down1957 tail-off1975 1533 T. More Apol. xviii, in Wks. 878/2 In this declinacion of the worlde. 1589 G. Puttenham Arte Eng. Poesie i. vi. 8 Then aboutes began the declination of the Romain Empire. a1638 J. Mede Summ. View Apoc. in Wks. (1672) v. 923 His Declination and Ruine we see is already begun. 1673 H. Stubbe Further Iustification War against Netherlands 82 The declination of antient Learning. 1799 G. Washington Let. in Writings (1893) XIV. 191 Although I have abundant cause to be thankful for..good health..yet I am not insensible to my declination in other respects. †6. The withholding of acceptance; non acceptance, modest or courteous refusal; declinature. ? Obsolete. ΘΚΠ the mind > language > statement > refusal > [noun] > courteous refusal declining1607 declination1618 declinement1680 declension1817 declinal1837 declinature1850 1618 Bp. J. Hall Contempl. IV. O.T. xii. 96 A modest declination of that honor, which hee saw must come. 1634 Bp. J. Hall Contempl. Hist. New Test. (STC 12640.5) 153 A voluntarie declination of their familiar conversation. 1884 Pall Mall Gaz. 21 Aug. 5/1 [The author] must excuse our declination to accept as possible characters in any possible social system, people so unnatural. 7. Astronomy. The angular distance of a heavenly body (north or south) from the celestial equator, measured on a meridian passing through the body: corresponding to terrestrial latitude. Formerly also the angular distance from the ecliptic. (The earliest and now most usual sense.) circle of declination or parallel of declination: see circle n. 2a, parallel n., adj., and adv. ΘΚΠ the world > the universe > heavenly body > position of heavenly body > [noun] > other declinationc1400 meridian altitudec1400 angle of position?a1560 zenith distance1588 refraction1603 azimuth1626 amplitude1627 horizontal parallax1665 complement1703 aberration1737 hour-angle1837 intercept1901 c1400 ( G. Chaucer Treat. Astrolabe (Cambr. Dd.3.53) (1872) ii. §17. 28 Al be it so þat fro [the] Equinoxial may the declinacion or the latitude of any body celestial be rikned..riht so may the latitude or the declinacion of any body celestial, saue only of the sonne..be rekned fro the Ecliptik lyne. c1400 ( G. Chaucer Treat. Astrolabe (Cambr. Dd.3.53) (1872) i. §17. 9 In this heued of cancer is the grettest declinacioun northward of the sonne. c1405 (c1395) G. Chaucer Franklin's Tale (Hengwrt) (2003) l. 538 Phebus..That in his hote declynacioun Shoon as the burned gold w^t stremys brighte. c1550 Complaynt Scotl. (1979) vi. 37 The mouyng eleuatione, and declinatione of the sone mune, and of the sternis. 1594 T. Blundeville Exercises ii. f. 53 The greatest declination which is 23. degrees, 2'8. 1794 R. J. Sulivan View of Nature I. 390 In consequence of the different declinations of the sun and moon at different times. 1814 J. Playfair Outl. Nat. Philos. II. i. i. 7 The arch of that circle intercepted between the star and the Equator, is called the Declination of the star. 1872 R. A. Proctor Ess. Astron. i. 2 To Herschel astronomy was not a matter of right ascension and declination. 8. Of the magnetic needle: †(a) (formerly) the dip n.³ or deviation from the horizontal (obsolete); (b) the deviation from the true north and south line, esp. the angular measure of this deviation; also called variation n. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > compass > variation north-easting1555 variation of the compass, (lodestone,) or needle?a1560 norwesting1561 north-westing1571 variation1595 declination1625 magnetic variation1696 variation of the variation1706 magnetic declination1787 1625 N. Carpenter Geogr. Delineated i. iii. 66 The Declination is a magnetical motion, whereby the magneticall needle converts it selfe vnder the Horizontall plaine, toward the Axis of the Earth. 1646 Sir T. Browne Pseudodoxia Epidemica ii. ii. 61 The Inclination or Declination of the Loadstone; that is, the descent of the needle below the plaine of the Horizon. View more context for this quotation 1865 D. Livingstone & C. Livingstone Narr. Exped. Zambesi vi. 133 Magnetical observations, for ascertaining the dip and declination of the needle. 1878 T. H. Huxley Physiography (ed. 2) i. 10 The divergence of the position of the magnetic needle from the true north-and-south line is called its declination, or by nautical men, its variation. 9. Dialling. Of a vertical plane (e.g. that of a wall): The angular measure of its deviation from the prime vertical (the vertical plane through the east and west points of the horizon), or from the meridian (that through the north and south points). ΚΠ 1593 T. Fale Horologiographia f. 4 The East and West are not said to decline, because the declination is accounted from the south and North to the direct East and West points. 1669 S. Sturmy Mariners Mag. vii. vi. 11 The Declination of a Plane is the Azimuthal Distance of his Poles from the meridian. 1703 Moxon's Mech. Dyalling (ed. 4) in Moxon's Mech. Exercises (new ed.) 314 If it do not point directly either East, West, North, or South, then so many degrees is the Declination of the Plane. 1737–51 E. Chambers Cycl. Declination of a plane, or wall, in dialling. †10. Grammar. = declension n. 4. Obsolete. ΘΚΠ the mind > language > linguistics > study of grammar > morphology > inflection > [noun] > declension declinationc1440 declension1565–78 declining1565 obliquity1668 the mind > language > linguistics > study of grammar > morphology > inflection > [noun] > declension > a declension declinationc1440 declension1569 c1440 J. Capgrave Life St. Katherine i. i. 259 To teche hir of retoryk and gramer the scole..The declynacions, þe personys, the modys, þe tens. 1530 J. Palsgrave Lesclarcissement Introd. 29 Pronownes of the fyrst declynation. 1603 J. Florio tr. M. de Montaigne Ess. i. xxv. 85 We did tosse our declinations, and conjugations to and fro. 1751 T. Smollett Peregrine Pickle I. xiii. 95 A perfect ignoramus, who scarce knows the declination of musa. Compounds C1. General attributive. declination-needle n. ΚΠ 1866 R. M. Ferguson Electricity 19 Instruments for determining magnetic declination are called declination needles or declinometers. C2. declination axis n. that axis of an equatorial telescope which is at right angles to the polar axis, and to which is attached at one end the telescope and at the other the declination circle, so called because when the position of the telescope is changed by turning the declination axis there is an alteration in the declination of the object viewed. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > parts of well1706 declination axis1835 declination circle1835 telescope driver1874 adaptive optics1966 1835 Mechanics' Mag. 24 210/2 On these rollers turns the declination axis. 1888 Encycl. Brit. XXIII. 146/2 The equatorial in its simplest form consists of an axis parallel to the earth's axis, called the ‘polar axis’; a second axis, at right angles to this, called the ‘declination axis’; and a telescope fixed at right angles to the latter. 1905 Westm. Gaz. 17 Apr. 1/3 A large equatorial with a 26-in. photographic refractor at one end of the declination axis and a 30-in. reflector at the other. 1964 R. H. Baker Astron. (ed. 8) iv. 108 The circle on the declination axis is graduated in degrees of declination. declination circle n. (a) (see quot. 1854); (b) the graduated circle on an equatorial telescope which marks the declinations of the heavenly bodies. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > astronomical telescopes > parts of well1706 declination axis1835 declination circle1835 telescope driver1874 adaptive optics1966 1835 Mechanics' Mag. 24 211 Y is the declination circle, fixed on the declination axis. 1854 H. Moseley Lect. Astron. (ed. 4) ix. 41 Declination-circles are those great circles which pass round the heavens from one pole to the other. 1888 Encycl. Brit. XXIII. 149/1 The declination circle is attached to the farther end of the declination axis. declination compass n. (see quot.). ΚΠ 1862 Chambers's Encycl. III. 461/1 The ordinary compass which must be used by making allowance for declination, is a declination compass. declination magnet n. a magnet used in determining the magnetic declination and the magnetic axis. ΚΠ 1883 Encycl. Brit. XV. 238/1 The first step is to remove the torsion as far as possible from the suspension fibre by hanging to it a brass plummet E of the same weight as the declination magnet. After this weight has come to rest, it is replaced by the declination magnet. 1899 Daily News 3 Mar. 5/2 They have placed out here a declination magnet, a dip instrument for the inclination of the needle, and a deflexion instrument. This entry has not yet been fully updated (first published 1894; most recently modified version published online September 2021). < n.c1400
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