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Multi-decade observing campaigns of the globular clusters 47 Tucanae and M15have led to an outstanding number of discoveries. Here, we report on the latestresults of the long-term observations of the pulsars in these two clusters. Formost of the pulsars in 47 Tucanae we have measured, among other things, theirhigher-order spin period derivatives, which have in turn provided stringentconstraints on the physical parameters of the cluster, such as its distance andgravitational potential. For M15, we have studied the relativistic spinprecession effect in PSR B2127+11C. We have used full-Stokes observations tomodel the precession effect, and to constrain the system geometry. We find thatthe visible beam of the pulsar is swiftly moving away from our line of sightand may very soon become undetectable. On the other hand, we expect to see theopposite emission beam sometime between 2041 and 2053.

Long-term observations of pulsars in the globular clusters 47 Tucanae and M15