Synthetic horizontal branch (HB) stars in globular clusters, when computed on the basis of HB evolutionary tracks and pulsation theory constraints, furnish the best theoretical scenarios for exploration of the age-metallicity relation in globular clusters. Preliminary results are presented from recently computed synthetic models of the horizontal

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Techniques involved in measurements of solar magnetic field are based on the observation and interpretation of the polarization signal in suitable Fraunhofer lines. This paper discusses some facts about polarized radiation, the physical concepts underlying such measurements, and the techniques involved. Particular attention is given to the

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