Abstract
Routine relative phase observations made during 1962 at Boulder on VLF signals radiated from NPM, Hawaii, and NBA, Canal Zone, have been analyzed to determine whether they show evidence of a semidiurnal lunar variation. It is found that the daytime observations of NBA show the presence of a significant (at the 5 per cent level) semidiurnal lunar height variation of 0.11 km; the maximum height occurs 2 hours before lunar transit. The nighttime observations of NBA and both the NPM observations are not inconsistent with the daytime NBA results. Some possible reasons for the lower significance of the nighttime NBA and NPM results are discussed.
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