Setting The Time And Constellation Dial - The Greenwich Masters CELESTIAL Instruction Manual

5. Setting the Time and Constellation Dial

Setting the time
1) When the second hand indicates 0 seconds, pull the crown out to the
second position.
2) Turn the crown and set the hour and minute hands to the correct time.
Move the minute hand 4 to 5 minutes ahead of the correct position and then
return it to the correct position.
3) Properly push the crown into its normal position in accordance with a
standard time signal or the like.
Setting the constellation dial
1) First it is necessary to find the correct sidereal time for the local standard
meridian or the universal time meridian.
2) Check the time difference in sidereal time between observation point
longitude and the standard meridian for the sidereal time source. Local
sidereal time depends on longitude, and is advanced four minutes per degree
eastward.
3) Pull the crown out to the first position.
4) Calculate the time obtained by adding the present sidereal time (displayed
on the 24 hour time scale) to the sum of the difference between local sidereal
time and present time. Find the value corresponding to this time on the right
ascension scale, and align it with the date scale turning the constellation
8.
dial clockwise.