The latest tilt data taken May 8-9, 2000, while tracking RCW 57.



Compare this with the March 20-21 tilt data:



Recall the equation for arbitrary azimuth, which is

arbitrary-az = 15*(UT - RA) + d/365

Since RA is constant to within the effect of two months of luni-solar precession, as d increases, UT must decrease for constant arbitrary az. This means that the peaks of the tilt curve must move forward with respect to time of day as date advances. Furthermore, since there are 50 days between March 20 and May 9, the curve must move forward by about 0.15 days. Upon comparison of the two curves, it can be seen that the displacement between the two curves is in the correct direction and by the amount expected, and that the magnitude of the effect seems fairly stable.