The deflection of the vertical due to the combined gravitational attraction of both the sun and moon appears in the observations made with the Ottawa PZT during the years 1962–1970. The values are very small, but the 95% confidence level shows they are real. The Love number (1 + k − l) was determined as 1.3 ± 0.9 from latitude readings, and 0.9 ± 0.8 from longitude, where the uncertainties quoted in both cases are the 95% confidence limits. The coefficient of correlation between observed and calculated residuals is 0.7 for longitude and for latitude readings.

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