Define the date and time used to calculate the position of the planets, comets, asteroids as well as the azimuth position and the proper motion.
It is possible to use the system date and time or you can enter any valid date and time between year -20000 and +20000. Therefore the planets position are only calculated for a date from -3000 to +3000. Beware with the negative year : 1BC is the year 0 and 2BC is the year -1.
If the option “Auto Refresh” has been selected, the screen will be updated according to the decided interval of seconds. Otherwise the default time is the one of the program start up and will be used throughout the session ( unless you manually refresh it with the button “Actual time”).
A time different from the actual one can be chosen by unselecting
Use system time and entering desired time manually. Note that defined time is local time of the actual observatory location and UT will depend on its time zone.
More Options allows to change the difference between the dynamic time used by the program and the standard time.