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Two new eJAAVSO preprints: Monitoring solar activity trends; Maxima and O–C diagrams for 489 Mira stars

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ejaavso 250: "Monitoring Solar Activity Trends With a Simple Sunspotter" by K. Larsen

ejaavso 251: "Maxima and O–C Diagrams for 489 Mira Stars" by T. Karlsson

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