Effect of Moon's position on observed clock‐corrections

Abstract

Possible detection of the influence of the Moon on observed clock‐corrections has been examined by tabulating according to hour‐angle and declination of the Moon the differences of two definitive clock‐corrections taken on the average of eight hours apart on the same night. These observations were taken on the 9‐inch transit circle at the United States Naval Observatory on 1,535 nights in the interval 1903–1921. The corrections were run together with definitive 24‐hour rates and the differences formed as given in Table 1. The differences were grouped every three hours for hour‐angle of the Moon at midnight, and for declinations of the Moon +28° to +15°, +15° to −15° , and −15° to −28°.