 The gear wheels have ratios 45/29, 71/151, and 257/187, producing a solar to sidereal ratio of 821115 to 818873 ((45 x 71 x 257 ) to (29 x 151 x 187)).This produces a value for the mean tropical year of 365.24219447.The worm gear serving the similar wheel of the mean-sun arm is connected to the input end of the gear box, and also, through a 3000