Table 1.

Cycle nomenclature and origins of the climatic precession and eccentricity from the secular fundamental frequencies

Named lithological expression of cycles*	Description	Argument	Periods and informal names of Milankovitch or orbital cycle with today’s period†
Van Houten cycle	Precession frequency of Earth (p) + secular frequency of precession of perihelion of Mercury, Venus…	p + g1, p + g2, p + g3, p + g4, p + g5	∼21 ky (average 21.5 ky); 23.2-, 22.4-, 19.2-, 19.0-, 23.8-ky climatic precession
Short modulating cycle	Secular frequencies of precession of perihelion of Mars − that of Jupiter, etc.	g4 − g5, g3 − g2, g4 − g2, g3 − g2	∼100 ky (average 112.1 ky); 94.9-, 98.9-, 123.9-, 130.7-ky short orbital eccentricity cycles
McLaughlin cycle	Venus (g2) − Jupiter (g5)	g2 − g5	405-ky long orbital eccentricity Grand Cycle
None	Venus (g2) − Mercury (g1)	g2 − g1	696-ky Grand Cycle
None	Mercury (g1) − Jupiter (g5)	g1 − g5	973-ky Grand Cycle
Long modulating cycle	Mars (g4) − Earth (g3)	g4 − g3	2,365-ky Grand Cycle

^*From ref. 9.

^†Using the g1–g5 values from ref. 5, table 6 and p from refs. 29 and 33, table 1.