Update UT1 - UTC dec07
UT1 - UTC (DUT1) is used to
from UTC to UT1. This is needed for pointing the telescope.
The Earth orientation dept. of the USNO publishes the measured and
values for DUT1. A fit is done to the "future" values and
used for the pointing. It is stored in the file :
The last fit was done dec06. New
data was loaded 27nov07 and refit. This is after the painting project
and before the new pointing model. The plots
show the Dut1
fit error from the new dec07 fit (.ps) (.pdf):
Page 1 shows the new fit using projected data
27nov07 to 22nov08. Top: Black is the data and red is the fit. Center
and bottom plots
show the fit error in mjd and date. The rms fit error is 20.
The largest excursion is about 35 millisecs.