Ekholm and Arrhenius(11) claim to have established the existence of a true tropical lunar period of 27.32 days, and also of a 26-day period, or, as they make it, a 25.9 2 9 -day period.
Ekholm, Om klimatets andringar i geologisk och historisk tid.
Ekholm and Arrhenius (84) claim to have established the existence of a tropical lunar period, and a 25.929-day period; while P. Polis (85) considers a synodic lunar period probable.
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