Over the last 1000 years five deep weakest(coldest) periods on the earth occurred around years 1030, 1315, 1500, 1680, 1805 which fell in respectively the Oort,Wolf, Sporer, Maunder and Dalton minimums of the sun. These five episodes are separated by approximately 200(+/- 70) year spans. At present it is generally accepted that the quasi bicentennial cycle of the sun is one of the most intense solar cycles.
See paper: Sources of the long term variations of the radiocarbon concentration in the earth atmosphere. by Vasilev S.S, Dergachev V.A, and Raspopov O.M. Geomagn.Aeron. 1999; 39(6): 80-89; see also The time of the end of the current solar cycle and the relationship between duration of the 11 year cycles and secular cycle phase. Kin. Phys.Celest.Bodies. 2006; 22: 141-143. Dr Habibullo Abdussamatov Polkovo Observatory St Petersburg.
(Note: Dr Abdussamatov has predicted a fast approaching New Little Ice Age starting about 2014 and continuing for the rest of this century gradually deepening as it progresses. www.ccsenet.org. Applied Physics Research Vol 4 No1 February 2012). This year 2013 being 208 years since the last coldest period in the Dalton minimum in 1805 the earth is in line for the next ice age condition.)