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We have studied solar activity and space weather conditions during multipleplanetary conjunction periods ( MPC) as observed from Earth during the years1850-2000 AD. Significant decreases in sunspot activity and solar 10.7 cm radioflux and absence of severe space weather conditions is found during most ofthese MPC . Possible planetary influences in longitudinal organisation ofsunspot activity is suggested by these results. The success of major spacemissions ( lunar and human) during MPC is also noticed during 1957-2000 AD. Theapplications of the above results include: short term space mission planningand inference/prediction of solar-terrestrial conditions during multipleplanetary conjunction periods.

On the decrease of sunspot activity and absence of severe space weather conditions during the multiple planetary conjunction periods of 1850-2000 AD