267:
considered over the time frame of a few hundred or thousand years. When viewed in this timeframe the so-called "precession of the equinoxes" can appear to be a secular phenomenon since the axial precession takes 25,771.5 years. Thus monitoring it over a much smaller timeframe appears to simply result
113:
is derived), and II. Of or belonging to an age or long period. The latter use appeared in the 18th century in the sense of "living or lasting for an age or ages". In the 19th century terms like
386:
A secular trend, widely tapered off and in some places ended, in which case a discrete developmental shift, has been found to apply across the continents in the average age of onset of
507:, in Journées 2000 - systèmes de référence spatio-temporels. J2000, a fundamental epoch for origins of reference systems and astronomical models, Paris, Septembre 2000, edited by
734:
Biro, Frank; Galvez, MP; Greenspan, LC; Succop, PA; Vangeepuram, N (Sep 2010), "Pubertal assessment method and baseline characteristics in a mixed longitudinal study of girls",
304:
398:) of girls from the 1940s to 2010s: beginning roughly 4 months earlier per decade. This is largely believed to be caused by nutritional changes in children over time.
452:
Revision of the tidal acceleration of the Moon and the tidal deceleration of the Earth's rotation from historical optical observations of planets
570:
486:
615:
Okasha, M; McCarron, P; McEwen, J; Smith, GD (2001). "Age at menarche: secular trends and association with adult anthropometric measures".
297:
42:). Whether a variation is perceived as secular or not depends on the available timescale: a variation that is secular over a timescale of
354:. The field has variations on timescales from milliseconds to millions of years – its rapid ones mostly come from currents in the
599:
516:
460:
149:
perturbations which exhibit repetition over the course of a given time frame. In this context it is referred to as secular motion.
656:(1999). "Secular trend of earlier onset of menarche with increasing obesity in black and white girls: the Bogalusa Heart Study".
248:
269:
263:
Depending on the time frame, perturbations can appear secular even if they are actually periodic. An example of this is the
347:
264:
39:
530:
478:
351:
779:
109:("of an age, occurring once in an age"), has two basic meanings: I. Of or pertaining to the world (from which
50:. Natural quantities often have both periodic and secular variations. Secular variation is sometimes called
689:
617:
216:
78:
806:
375:
273:
811:
539:
371:
277:
189:
142:
86:
74:
336:
47:
761:
716:
665:
634:
595:
566:
512:
482:
456:
432:
204:
162:
414:
362:. The secular variations are those over periods of a year or more, reflecting changes in the
780:"Examination of US Puberty-Timing Data from 1940 to 1994 for Secular Trends: Panel Findings"
751:
743:
706:
698:
626:
543:
508:
367:
296:
deviations for planets, observing ordinary satellite orbits. Others are referred to as post-
232:
181:
177:
133:, secular variations are distinguished from periodic phenomena. In particular, astronomical
653:
528:
Bretagnon, P. (1982). "Théorie du mouvement de l'ensemble des planètes. Solution VSOP82".
309:
685:"Evidence for a downward secular trend in age of menarche in a rural Gambian population"
756:
711:
684:
591:
220:
90:
292:. Several attempts have from time to time been undertaken to analyze and predict such
800:
359:
320:
778:
Euling, Susan; Herman-Giddens, Marcia; Lee, Peter; Selevan, Sherry (February 2008).
502:
450:
200:
Secular phenomena create variations in the orbits of the Moon and the planets. The
185:
150:
59:
335:
for long, medium and short time frames. Some traders identify market trends using
255:. It was discovered early but it was some time before it was correctly explained.
176:
Most of the known perturbations to motion in stable, regular, and well-determined
17:
293:
252:
236:
35:
702:
630:
588:
The
Magnetic Field of the Earth: Paleomagnetism, the Core, and the Deep Mantle
363:
355:
288:
Secular variation also refers to long-term trends in the orbits of all of the
208:
154:
110:
562:
134:
130:
82:
70:
765:
747:
720:
669:
638:
121:
appeared in astronomy, and similar language was used in economics by 1895.
391:
170:
683:
Prentice, S; Fulford, AJ; Jarjou, LM; Goldberg, GR; Prentice, A (2010).
586:
Merrill, Ronald T.; McElhinny, Michael W.; McFadden, Phillip L. (1996).
504:
A new approach to interpretation of the non-precessional equinox motion
395:
387:
289:
228:
158:
66:
43:
46:
may be a segment of what is, over a timescale of millions of years, a
166:
224:
212:
201:
188:
result in some effects which are unidirectional (for example,
276:
of approximately one degree per 71.6 years, influencing the
65:
The term is used wherever time series are applicable in
652:
Wattigney, WA; Srinivasan, SR; Chen, W; Greenlund, KJ;
557:Edwards, R.; McGee, J.; Bessetti, W. H. C. (2007).
590:. International Geophysics Series. Vol. 63.
511:, Observatoire de Paris (2001), pp. 119 – 120.
141:to label the longest duration or non-oscillatory
153:ephemerides are essential for the navigation of
157:and for all kinds of space observations of the
223:. Consensus has determined these to have been
38:is its long-term, non-periodic variation (see
305:Variations Séculaires des Orbites Planétaires
8:
235:during human evolution, dwarfed by complex
366:. Phenomena associated with these include
180:tend to be periodic at some level, but in
145:in the motion of planets, contrasted with
755:
710:
406:
394:/first menstruation and beginning of
7:
268:in a "drift" of the position of the
312:that tries to address the problem.
559:Technical Analysis of Stock Trends
25:
249:secular acceleration of the Moon
27:Long-term non-periodic variation
350:refers to some changes in the
265:precession of the Earth's axis
1:
348:Geomagnetic secular variation
343:Geomagnetic secular variation
225:among the smallest of factors
531:Astronomy & Astrophysics
40:decomposition of time series
828:
479:Cambridge University Press
475:Fundamentals of Geophysics
58:when the emphasis is on a
703:10.3109/03014461003727606
631:10.1080/03014460150201896
437:Oxford English Dictionary
473:Lowrie, William (2004).
690:Annals of Human Biology
658:Ethnicity & Disease
618:Annals of Human Biology
544:1982A&A...114..278B
382:Biological anthropology
79:biological anthropology
748:10.1542/peds.2009-3079
433:"secular, adj. and n."
352:Earth's magnetic field
105:, from the Latin root
60:linear long-term trend
463:(2001) pp. 231 - 234.
376:geomagnetic reversals
274:plane of the ecliptic
239:and magnetic cycles.
115:secular acceleration
501:Jurij B. Kolesnik;
308:(VSOP) is a modern
278:Milankovitch cycles
190:planetary migration
87:celestial mechanics
75:operations research
449:Jyri B. Kolesnik;
396:breast development
337:technical analysis
323:are classified as
163:natural satellites
48:periodic variation
572:978-0-8493-3772-7
488:978-0-521-46164-1
205:emission spectrum
182:many-body systems
178:dynamical systems
119:secular variation
32:secular variation
18:Secular phenomena
16:(Redirected from
819:
792:
791:
775:
769:
768:
759:
731:
725:
724:
714:
680:
674:
673:
649:
643:
642:
612:
606:
605:
583:
577:
576:
554:
548:
547:
525:
519:
499:
493:
492:
470:
464:
447:
441:
440:
429:
423:
422:
419:Etymology Online
415:"secular (adj.)"
411:
368:geomagnetic jerk
186:chaotic dynamics
21:
827:
826:
822:
821:
820:
818:
817:
816:
797:
796:
795:
777:
776:
772:
733:
732:
728:
682:
681:
677:
651:
650:
646:
614:
613:
609:
602:
585:
584:
580:
573:
556:
555:
551:
527:
526:
522:
500:
496:
489:
472:
471:
467:
448:
444:
431:
430:
426:
413:
412:
408:
404:
384:
345:
318:
310:numerical model
286:
261:
245:
198:
127:
99:
28:
23:
22:
15:
12:
11:
5:
825:
823:
815:
814:
809:
799:
798:
794:
793:
770:
742:(3): e583–90,
726:
697:(5): 717–721.
675:
664:(2): 181–189.
644:
607:
600:
592:Academic Press
578:
571:
565:. p. 17.
549:
520:
494:
487:
465:
442:
424:
405:
403:
400:
383:
380:
372:westward drift
344:
341:
317:
314:
285:
282:
260:
257:
244:
241:
221:galactic plane
213:secular trends
197:
194:
126:
123:
98:
95:
91:VSOP (planets)
85:(particularly
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
824:
813:
810:
808:
805:
804:
802:
789:
785:
781:
774:
771:
767:
763:
758:
753:
749:
745:
741:
737:
730:
727:
722:
718:
713:
708:
704:
700:
696:
692:
691:
686:
679:
676:
671:
667:
663:
659:
655:
648:
645:
640:
636:
632:
628:
624:
620:
619:
611:
608:
603:
601:9780124912458
597:
593:
589:
582:
579:
574:
568:
564:
560:
553:
550:
545:
541:
537:
533:
532:
524:
521:
518:
517:2-901057-45-4
514:
510:
506:
505:
498:
495:
490:
484:
480:
476:
469:
466:
462:
461:2-901057-45-4
458:
454:
453:
446:
443:
438:
434:
428:
425:
420:
416:
410:
407:
401:
399:
397:
393:
389:
381:
379:
377:
373:
369:
365:
361:
360:magnetosphere
357:
353:
349:
342:
340:
338:
334:
330:
326:
322:
321:Market trends
316:Market trends
315:
313:
311:
307:
306:
301:
299:
295:
294:gravitational
291:
283:
281:
279:
275:
271:
266:
258:
256:
254:
250:
242:
240:
238:
234:
230:
227:to influence
226:
222:
218:
214:
210:
206:
203:
195:
193:
191:
187:
183:
179:
174:
172:
168:
164:
160:
156:
152:
148:
144:
143:perturbations
140:
136:
132:
124:
122:
120:
116:
112:
108:
104:
96:
94:
92:
88:
84:
80:
76:
72:
68:
63:
61:
57:
56:secular drift
53:
52:secular trend
49:
45:
41:
37:
33:
19:
807:Geomagnetism
787:
783:
773:
739:
735:
729:
694:
688:
678:
661:
657:
654:Berenson, GS
647:
625:(1): 68–78.
622:
616:
610:
587:
581:
558:
552:
535:
529:
523:
509:N. Capitaine
503:
497:
474:
468:
451:
445:
436:
427:
418:
409:
385:
364:Earth's core
346:
332:
328:
324:
319:
303:
302:
287:
262:
253:tidal forces
246:
237:solar cycles
219:through the
199:
196:Solar System
175:
151:Solar System
146:
138:
128:
118:
114:
106:
102:
100:
64:
55:
51:
31:
29:
812:Time series
538:: 278–288.
251:depends on
135:ephemerides
36:time series
801:Categories
784:Pediatrics
736:Pediatrics
402:References
356:ionosphere
233:extinction
209:solar wind
155:spacecraft
111:secularity
107:saecularis
89:) such as
563:CRC Press
333:secondary
300:effects.
298:keplerian
217:migration
131:astronomy
125:Astronomy
101:The word
97:Etymology
83:astronomy
71:economics
44:centuries
766:20696727
721:20465526
670:10421080
639:11201332
392:menarche
215:due to
207:and the
171:galaxies
161:, their
147:periodic
757:4460992
712:3575631
540:Bibcode
388:puberty
329:primary
325:secular
290:planets
284:Planets
272:in the
270:equinox
229:climate
211:follow
159:planets
139:secular
103:secular
67:history
764:
754:
719:
709:
668:
637:
598:
569:
515:
485:
459:
81:, and
455:, in
259:Earth
202:solar
167:stars
34:of a
790:(3).
762:PMID
717:PMID
666:PMID
635:PMID
596:ISBN
567:ISBN
513:ISBN
483:ISBN
457:ISBN
374:and
358:and
331:and
247:The
243:Moon
231:and
169:and
137:use
117:and
30:The
788:121
752:PMC
744:doi
740:126
707:PMC
699:doi
627:doi
536:114
192:).
129:In
54:or
803::
786:.
782:.
760:,
750:,
738:,
715:.
705:.
695:37
693:.
687:.
660:.
633:.
623:28
621:.
594:.
561:.
534:.
481:.
477:.
435:.
417:.
378:.
370:,
339:.
327:,
280:.
184:,
173:.
165:,
93:.
77:,
73:,
69:,
62:.
746::
723:.
701::
672:.
662:9
641:.
629::
604:.
575:.
546:.
542::
491:.
439:.
421:.
390:(
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.