水沢における緯度の日周変化

抄録

The diurnal variation in the latitude is discussed on the results obtained with the Mizusawa PZT for the period from 1957 to 1960.
The conditional equation to derive the diurnal variation is as follows :
Δψ_i=Δψ₀+Δδ_i+a sin 2π τ_i+b cos 2π τ_i+c sin 4π τ_i+d cos 4π τ_i+k(Cc'+Dd'),
δ_i:declination correction to the group i τ_i: unit in day.
The results are derived with two assumptions of Δδ_i≠0 and Δδ_i=0 and are given as follows.
Some explanations for the cause of the diurnal variation are made, but they reveal themselves to be poor for the purpose.
The close inverse correlation is found between the semidiurnal variation in both atmos-pheric pressure and the latitude observed with the Mizusawa PZT.