Introduction | 29 | 
Half a synodic month can be mapped to the transit times of the Moon. The tran- 
sit hour is the time of the Moon’s transit after midnight or after noon. A transit 
with 0 transit hours corresponds to a full moon or a new moon. 
Within a synodic month, the Moon transits every 24 hours. Atransit hour (Trh) 
can be defined as 1/24 of the synodic month: 
1 Trh 360° 1 15° 29,5306 h 
= ——z 5 = ————z = 29, ; 
(S-h) 24 (s$-h) 
The period of the semi-monthly inequality (HU) can be converted into a corre- 
sponding angular velocity: 
JHU = 
360° . 
Pr - 2($ — h) = 1,01589576°/h = 30°/Trh 
HU 
The angular velocity ou is used in the model function for the analysis of the 
semi-monthly inequality.