Tidal oscillations on the sun raised by the planets, such as Jupiter, Venus, Earth and Mercury, were calculated assuming an equilibrium theory. The calculated periods of the main tides were 12.6, 14.1, 13.4, 17.5 and 14.6 days (corresponding to semidiurnal tides in the ocean),3.89, 6.55, 1.475, 9.59, 2.375, 3.013, 13.318, 1.903, 5.576 and 2.890, months (corresponding to long periodic tides). Such periodicities were searched for in the sunspots, the solar constants,700 mb heights, surface pressures and others, and it was proved that some of them were statistically significant. We may conclude, therefore, that the solar activities are affected by the tidal oscillations, and such periodicities appear in the atmosphere through solar radiations though the mechanism is not clear. The order of magnitudes of the relative amplitudes of such periodicities was 10
-4∼10
-5 for both solar activities and meteorological phenomena. Therefore, such variation may be neglected so far as daily variations are concerned, but, it cannot be neglected in dealing with monthly or annual variations in the meteorological phenomena.
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